List of floppy disk formats

{{for|a more in-depth textual description of some of these formats|Floppy disk variants}}

File:floppy disk 2009 G1.jpg

This is a list of different floppy disk formats.

Physical formats

class="wikitable mw-collapsible" \|+ !Size !! Density !Sides!! Tracks !! tpi !! bpi !Sectoring!! Coercivity !! Unformatted capacity per side
2 inch Video Floppy \| \| \|52 \|256 \| \| \| \|>800 kB or 50 fields of analog video{{Cite patent\|number=US4609949A\|title=Magnetic disc reproducing apparatus\|gdate=1986-09-02\|assign1=Sony Corporation\|invent1=Kutaragi, Ken\|url=https://patents.google.com/patent/US4609949A/en?oq=4609949}}
2 inch LT-1 \|Double \| \|80 \|245 \| \| \| \|
2{{frac\|1\|2}} inch	Single \|	16{{cite book \|url=http://sharppocketcomputers.com/4HK7JnFJDuVm/Service/ce1600f_service_manual.pdf \|title=Sharp PC-1600 Service Manual \|date=July 1986 \|publisher=Sharp Corporation, Information Systems Group, Quality & Reliability Control Center \|location=Yamatokoriyama, Japan \|pages=98–104 \|chapter=Model CE-1600F \|access-date=2017-03-23 \|archive-url=https://web.archive.org/web/20170323132153/http://sharppocketcomputers.com/4HK7JnFJDuVm/Service/ce1600f_service_manual.pdf \|archive-date=2017-03-23 \|url-status=live}}{{cite book \|url=http://pockemul.free.fr/Documents/ce-140f_Service_manual.pdf \|title=Sharp Service Manual Model CE-140F Pocket Disk Drive \|publisher=Sharp Corporation \|id=00ZCE140F/SME \|access-date=2017-03-11 \|archive-url=https://web.archive.org/web/20170311145818/http://pockemul.free.fr/Documents/ce-140f_Service_manual.pdf \|archive-date=2017-03-11 \|url-status=live}}	48	\|		64 kB
3 inch QuickDisk	\|			\|
rowspan="2" \|3.25 inch \|Single \| rowspan="2" \|1 \| rowspan="2" \|80{{Cite book \|url=https://twitter.com/Foone/status/1316017501621215233/photo/1 \|title=Tabor TC-500 Specifications \|publisher=Tabor Corp \|location=USA \|language=en \|archive-url=https://web.archive.org/web/20220112061305/https://twitter.com/Foone/status/1316017501621215233/photo/1 \|archive-date=12 Jan 2022}} \| rowspan="2" \|140 \|4,625 \| rowspan="2" \| \| rowspan="2" \| \|250 kB
Double \|9,250 \|500 kB
rowspan="5" \| 3{{frac\|1\|2}} inch	Single \| rowspan="5" \|2	40{{cite web \|url=http://electrickery.xs4all.nl/comp/px8/doc/PF-10Manual.pdf \|title=PF-10 \|author= \|date=1984 \|publisher=Epson \|access-date=November 30, 2022 \|quote= \|archive-url=https://web.archive.org/web/20200621102808/http://electrickery.xs4all.nl/comp/px8/doc/PF-10Manual.pdf \|archive-date=June 21, 2020}}	67.5	8,650 \| rowspan="5" \|Soft	665 Oe	250 kB{{cn \|date=November 2022}}
Double \| 80	135	8,717	665 Oe{{Cite web \|title=Floppy Drive Tech Info \|url=http://www.retrotechnology.com/herbs_stuff/drive.html \|access-date=2023-07-06 \|website=www.retrotechnology.com}}	500 kB{{cn \|date=November 2022}}
High	80	135	17,434	720-750 Oe	1 MB
Extended	80	135	34,868	rowspan="2" \|900 Oe	2 MB
Triple{{cite book \|title=NEC μPD72070 - Floppy Disk Controller Specification Version 2.0 \|version=2.0 preliminary \|publisher=NEC Corporation \|date=October 1991 \|url=http://dec8.info/Apple/uPD72070.pdf \|access-date=2017-03-20 \|url-status=dead \|archive-url=https://web.archive.org/web/20170320235834/http://dec8.info/Apple/uPD72070.pdf \|archive-date=2017-03-20 }}	240{{cite web \|url=http://www.pc88.gr.jp/va/va-hard.html \|archiveurl=https://web.archive.org/web/20170618120229/http://www.pc88.gr.jp/va/va-hard.html \|archivedate=2017-06-18 \|url-status=live \|language=ja \|website=NEC PC-88VA \|trans-title=Hardware \|title=ハードウエア}}	406.5	36,700	6.5 MB
4 inch DemiDiskette \| \|1{{Cite patent\|number=US4482929A\|title=Magnetic recording disk cartridge\|gdate=1984-11-13\|invent1=Beck\|invent2=Bornhorst\|invent3=Smith\|invent4=Zell\|inventor1-first=John L.\|inventor2-first=Randy J.\|inventor3-first=Donald J.\|inventor4-first=Michael N.\|url=https://patents.google.com/patent/US4482929/en}} \| \| \| \| \| \|
rowspan="5" \| 5{{frac\|1\|4}} inch	Single/Double \| rowspan="5" \|2	40	48	5,876 \| rowspan="3" \|Soft or hard	300 Oe	250 kB
Quad	77	100		300 Oe	500 kB (Micropolis-compatible)
Quad	80	96	5,922	300 Oe	500 kB
High	80	96	9,646 \| rowspan="2" \|Soft	600 Oe	833 kB
EH{{Cite web \|date=1986 \|title=Fujitsu Sales Prospector 1986 \|url=https://archive.org/details/bitsavers_fujitsuFuj1986_53231193 \|archive-url= \|archive-date= \|access-date=2023-11-07 \|website=Archive.org \|page=238}} \|104 \|125 \|29,560 \| \|6.5 MB{{Cite web \|date=1985-01-06 \|title=コンピュータ・情報システム・パソコン・周辺機器 \|trans-title=Hitachi Computer Peripherals \|url=https://www.hitachihyoron.com/jp/pdf/1985/01/1985_01_06.pdf \|access-date=2023-11-07 \|website=hitachihyoron.com \|page=9 }}
5{{frac\|1\|4}} inch Apple FileWare \|Double \|2 \|80 \|62.5 \| \|Soft \| \|851 kiB{{Cite book \|last=Berry \|first=D \|url=http://www.bitsavers.org/pdf/apple/lisa/hardware/Lisa_Hardware_Manual_Sep82.pdf \|title=Lisa Hardware Manual \|date=7 September 1982 \|publisher=Apple Computer Inc. \|pages=9–1}}
rowspan="3" \| 8 inch	Single \|	rowspan="2" \| 77	rowspan="2" \| 48	3,268-3,408 \| rowspan="2" \|Soft or hard (inner edge) \| rowspan="2" \| 300 Oe	1 MB
Double \| \|6,816 \|1 MB
HD{{Cite web \|date=1986 \|title=Fujitsu Sales Prospector 1986 \|url=https://archive.org/details/bitsavers_fujitsuFuj1986_53231193 \|via=Archive.org \|pages=238,239}} \| \|154 \|96 \|20,560 \| \|600 Oe \|9.6 MB{{Cite web \|date=1984-08-03 \|title=FDD-441大容量フロッピーディスク駆動装置の開発 \|trans-title=Development of FDD-441 Large-Capacity Floppy Disk Drive \|url=https://www.hitachihyoron.com/jp/pdf/1984/08/1984_08_03.pdf \|access-date=2023-11-07 \|website=hitachihyoron.com \|page=3}}
rowspan="2" \|8 inch Memorex FD \|650 \| rowspan="2" \|1{{Cite book \|url=http://archive.org/details/bitsavers_memorexdispyOEM_1669950 \|title=650 Flexible Disc File OEM Manual 2944.010 \|publisher=Memorex Corp \|year=1972 \|pages=9 \|language=en}} \|50 \| \|2,400 \| rowspan="2" \|Hard (outer edge) \| rowspan="2" \| \|1.5 Mb
651 \|64{{Cite book \|url=https://mrxhist.org/docs/Myle_5533.pdf \|title=Memorex Markette Flexible Discs \|publisher=Memorex Corp \|year=1978 \|location=USA \|pages=1–2 \|language=en}} \| \|3,100 \|2.5 Mb{{Cite book \|url=http://archive.org/details/bitsavers_memorexdispyOEM_1644196 \|title=Memorex 651 Flexible Disc File OEM Manual \|publisher=Memorex Corp \|year=1977 \|location=USA \|pages=4 \|language=en}}
8 inch Burroughs \|Double \|2 \|139 \|150 \|7,100 \| \| \|2

Logical formats

Throughout the 1970s and 1980s, many different logical disk formats were used, depending on the hardware platform.

class="wikitable sortable mw-collapsible"

|+ Common floppy disk formats, logical characteristics by platform

!Platform !! Size !! Density !! Sides !! Tracks/ side !! Sectors/ track !! Bytes/ sector

!Sectoring!! Capacity !! rpm !! Encoding !! Note

rowspan="8" | Acorn

| rowspan="5" | 5{{frac|1|4}} inch

| rowspan="2" | Single

| rowspan="2" | 1

| 40

| rowspan="2" | 10

| rowspan="2" | 256

| rowspan="8" |Soft

| 100 kB

| rowspan="5" | 300

| rowspan="2" | FM

| 200 kB

rowspan="3" | Double

| rowspan="2" | 1

| 40

| rowspan="3" | 16

| rowspan="3" | 256

| 160 kB

| rowspan="3" | MFM

rowspan="2" | 80

| 320 kB

| 640 kB

rowspan="3" | 3{{frac|1|2}} inch

| rowspan="2" | Double

| rowspan="3" | 2

| rowspan="3" | 80

| 16

| 256

| 640 kB

| rowspan="3" | 300

| rowspan="3" | MFM

| Format L: MOS (Electron, Master Compact)

| rowspan="2" | 1024

| 800 kB

| {{ubl|Format D: Arthur, RISC iX|Format E: RISC OS}}

High

| 10

| 1,600 kB

| Format F: RISC OS 3 and later. Archimedes models before the A5000 require an upgraded floppy drive.

Agat

| 5{{frac|1|4}} inch

| Double

| 2

| 80

| 21

| 256

| 840 kB

| 300

| MFM

| Custom controller with unique track layout.[https://github.com/sintech/AGAT/blob/master/docs/agat-840k-format.txt]

Amstrad CPC/PCW

| 3 inch

| Double

| 1

| 40

| 9

| 512

| 180 kB

| 300

| MFM

| Single head drive, but double-sided floppy discs (total of 360 kB per floppy)

Amstrad PCW8512/9512

| 3 inch

| Double

| 2

| 80

| 9

| 512

| 720 kB

| 300

| MFM

| 720 kB mode uses both sides - ensure disc inserted correct way up.

rowspan="5" | Apple II

| rowspan="2" | 5{{frac|1|4}} inch

| rowspan="2" | Double

| 1

| rowspan="2" | 35

| 13

| rowspan="2" | 256

| rowspan="5" | Soft

| 113.75 kB

| rowspan="2" | 300

| rowspan="2" | GCR

| rowspan="2" | 16 sector filesystems require a compatible disk controller (PROM update) and Apple DOS 3.3 or later.

| 16

| 140 kB

rowspan="3" | 3{{frac|1|2}} inch

| rowspan="2" | Double

| 1

| rowspan="2" | 80

| rowspan="2" | Variable (8-12)

| rowspan="2" | 512

| 400 kB

| rowspan="2" | 394 - 590

| rowspan="2" | GCR

| rowspan="2" | Apple II double-density 3{{frac|1|2}}-inch (90 mm) drives use variable sectors sizes (tracks 00-15: 12 sectors, tracks 16-31: 11 sectors, tracks 32-47: 10 sectors, tracks 48-63: 9 sectors, tracks 64-79: 8 sectors), 394 rpm to 590 rpm. [https://support.apple.com/kb/TA39910?locale=en_US&viewlocale=en_US]

| 800 kB

High

| 2

| 80

| 18

| 512

| 1,440 kB

| 300

| MFM

| Apple II high-density 3{{frac|1|2}}-inch (90 mm) drives require a compatible disk controller and ProDOS 8.

Apple Lisa

| 5{{frac|1|4}} inch FileWare

| Double

| 2

| 46

| Variable (15-22)

| 512

|Soft

| 851 kB

| 218 - 320{{Cite web |title=Apple's Twiggy Disks |url=http://www.brouhaha.com/~eric/retrocomputing/lisa/twiggy.html |access-date=2023-10-11 |website=www.brouhaha.com}}

| GCR

Apple Lisa 2/Macintosh XL,

Macintosh

| rowspan="3" | 3{{frac|1|2}} inch

| rowspan="2" | Double

| 1

| rowspan="2" | 80

| rowspan="2" | Variable (8-12)

| rowspan="2" | 512

| rowspan="3" | Soft

| 400 kB

| rowspan="2" | 394 - 590

| rowspan="2" | GCR

rowspan="2" | Apple Macintosh

| 2

| 800 kB

| rowspan="2" |

High

| 2

| 80

| 18

| 512

| 1,440 kB

| 300

| MFM

rowspan="4" | Atari 8-bit

| rowspan="4" | 5{{frac|1|4}} inch

| Single

| rowspan="3" | 1

| rowspan="4" | 40

| 18

| 128

| rowspan="4" | Soft

| 90 kB

| rowspan="3" | 288

| FM

| rowspan="4" | Third party drives offer up to 1440 KB.

Dual

| 26

| 128

| 130 kB

| rowspan="3" | MFM

Double

| 18

| 256

| 180 kB

Double

|18

|256

|360 kB

|300

rowspan="3" | Atari ST/TT/Falcon

| rowspan="3" | 3{{frac|1|2}} inch

| rowspan="2" | Double

| rowspan="1" | 1

| rowspan="3" | 80

| rowspan="2" | 9

| rowspan="3" | 512

| rowspan="3" | Soft

| 360 kB

| rowspan="3" | 300

| rowspan="3" | MFM

rowspan="2" | 2

| 720 kB

High

| 18

| 1,440 kB

Coleco ADAM

| 5{{frac|1|4}} inch

| Double

| 1

| 40

| 8

| 512

|soft

| 160 kB

| 300

| MFM

rowspan="5" | Commodore 64 (8-bit)

| rowspan="4" | 5{{frac|1|4}} inch

| rowspan="2" | Double

| 1

| rowspan="2" | 35

| rowspan="2" | Variable (17-21) ZCAV

| rowspan="4" | 256

| rowspan="5" | Soft

| 170 kB

| rowspan="5" | 300

| rowspan="4" | GCR

| rowspan="4" | Commodore floppy drives used a fixed rotation speed with variable sector density (see: Zone bit recording).

| 340 kB

rowspan="2" | Quad

| 1

| rowspan="2" | 77

| rowspan="2" | Variable (23-29) ZCAV

| 521 kB

| 1,042 kB

3{{frac|1|2}} inch

| Double

| 2

| 80

| 10

| 512

| 800 kB

| MFM

rowspan="5" | Commodore Amiga

| rowspan="2" | 5{{frac|1|4}} inch

| Double

| rowspan="5" | 2

| 40

| rowspan="3" | 11

| rowspan="5" | 512

| rowspan="5" | Soft

| 440 kBThis format was used by the Amiga 1020 external floppy drive and some third-party drives connected to the normal Amiga floppy drive bus.

| rowspan="4" | 300

| rowspan="3" | MFM

| rowspan="3" | Though the Amiga used MFM, the format places sectors too close together for a standard IBM PC compatible floppy disk controller to read (appearing as one 5632-byte physical sector per track).

Quad

| rowspan="4" | 80

| 880 kBFormat used by rare third-party drives with quad density disks; such drives were usually switchable between 80-track and 40-track (A1520/PC-compatible) operation.

rowspan="3" | 3{{frac|1|2}} inch

| Double

| 880 kB

rowspan="2" | High

| 19

| 1,520 kB

| GCR

| Format used by third-party [http://aminet.net/package/docs/hard/drv-1.44 gcrdisk.device] driver in order to use PC-standard HD floppy drives (which rotated at a fixed 300 rpm) via the Amiga floppy drive bus. The Amiga's floppy controller could not keep up with the data rate needed for MFM recording on HD floppies without reducing rotational speed, so the third party driver used an alternate GCR mode.

| 1,760 kB

| 150

| MFM

Commodore 900

|5{{frac|1|4}} inch

|High

|80

|13-16

|512

|Soft

|1,200kB

|GCR

|https://vintagecomputer.ca/files/Commodore/C900/C900%20Floppy%20Specification.pdf

rowspan="3" |IBM 33FD

| rowspan="8" |8 inch

| rowspan="5" |Single

| rowspan="3" |1

| rowspan="8" |77

|26

|128

|240.5 kiB

| rowspan="8" |360

| rowspan="5" |FM

| rowspan="3" |Diskette 1{{Cite book |url=http://bitsavers.trailing-edge.com/pdf/ibm/floppy/GA21-9182-4_Diskette_General_Information_Manual_Aug79.pdf |title=The IBM Diskette General Information Manual |publisher=IBM |year=1979 |location=USA |pages=18–19 |type=Reference Manual}}

|256

|277.5 kiB

|512

|296 kiB

rowspan="2" |IBM 43FD

| rowspan="5" |2

|26

|128

|481 kiB

| rowspan="2" |Diskette 2

|256

|555 kiB

id="IBM 53FD"

| rowspan="3" |IBM 53FD

| rowspan="3" |Double

|26

|256

|962 kiB

| rowspan="3" |MFM

| rowspan="3" |Diskette 2D

|512

|1.08 MiB

|1,024

|1.16 MiB

DEC RX01

|8 inch

|Single

|77

|26

|128

|250 kB

|360

|FM

DEC RX02

|8 inch

|Double

|77

|26

|256

|500 kB

|360

|FM/MFM

DEC RX50

| 5{{frac|1|4}} inch

| Quad

| 1

| 80

| 10

| 512

| 400 kB

| 300

| MFM

rowspan="19" | IBM PC compatibles

| rowspan="4" | 8 inch

| rowspan="2" | Single

| 1

| rowspan="4" | 77

| rowspan="2" | 26

| rowspan="2" | 128

| rowspan="19" | Soft

| 250.25 kBThe calculated formatted capacity is based on FAT12 format.{{cite web |url=https://jeffpar.github.io/kbarchive/kb/075/Q75131/ |title=Standard Floppy Disk Formats Supported by MS-DOS |publisher=Microsoft |date=2000-12-17 |access-date=2020-02-05 |version=2.0}}{{cite book |publisher=Xerox |date=November 1983 |title=Xerox 16/8 Professional Computer – MS-DOS OS Handbook for 8" Floppy Disks |url=http://bitsavers.trailing-edge.com/pdf/xerox/820-II/610P72377_MS-DOS_OS_Handbook_for_8_Inch_Floppy_Disks_Nov83.pdf}}

| rowspan="4" | 360

| rowspan="2" | FM

| rowspan="4" | While IBM didn't include an 8-inch floppy drive option on any of their PCs and PC DOS, MS-DOS 1.25 supported 8-inch disks and added support for higher capacities in version 2.0. MS-DOS' predecessor 86-DOS used 8-inch diskettes as well.

| 500.5 kB

rowspan="2" | Double

| 1

| rowspan="2" | 8

| rowspan="2" | 1,024

| 616 kB

| rowspan="2" |MFM

| 1,232 kB

rowspan="7" | 5{{frac|1|4}} inch

| rowspan="4" | Double

| 1

| rowspan="4" | 40

| rowspan="2" | 8

| rowspan="7" | 512

| 160 kB

| rowspan="4" | 300

| rowspan="7" | MFM

| rowspan="7" |

| 320 kB

| rowspan="2" | 9

| 180 kB

| 360 kB

rowspan="2" | QuadRare format appearing on some early PC/XT clones using quad-density disks.

| 1

| rowspan="2" | 80

| rowspan="2" | 8

| 320 kB

|rowspan="2" | 300

| 640 kB

High

| 2

| 80

| 15

| 1,200 kB

| 360

rowspan="8" | 3{{frac|1|2}} inch

| rowspan="4" | Double

| rowspan="2" | 1

| rowspan="6" | 80

| 8

| rowspan="8" | 512

| 320 kB

| rowspan="8" | 300

| rowspan="8" | MFM

| 360 kB

rowspan="6" | 2

| 8

| 640 kB

| 720 kB

rowspan="3" | High

| 18

| 1,440 kB

rowspan="2" | 21

| 1,680 kB

| rowspan="2" | DMFThese variations are known as DMF diskettes, used for a time to pack more data on to each disk for software distribution.

| 1,720 kB

Extended

| 80

| 36

| 2,880 kB

MGT SAM Coupé

| 3{{frac|1|2}} inch

| Double

| 2

| 80

| 10

| 512

| 800 kB

| 300

| MFM

rowspan="12" | NEC PC98

| rowspan="2" | 8 inch

| Single

| 1

| 77

| 26

| 128

| 250.25 kB

| rowspan="2" | 360

| FM

| rowspan="2" |

Double

| 2

| 77

| 8

| 1,024

| 1,232 kB

| MFM

rowspan="4" | 5{{frac|1|4}} inch

| rowspan="2" | Double

| rowspan="4" | 2

| rowspan="3" | 80

| 8

| rowspan="3" | 512

| 640 kB

| rowspan="4" | 360

| rowspan="4" | MFM

| 720 kB

rowspan="2" | High

| 15

| 1,200 kB

77 (80)

| 8

| 1,024

|1,232 (1,280) kB

|Inner 3 tracks of 8 sectors/track format are unused.

rowspan="6" | 3{{frac|1|2}} inch

| rowspan="2" | Double

| rowspan="6" | 2

| rowspan="3" | 80

| 8

| rowspan="3" | 512

| 640 kB

| rowspan="4" | 360

| rowspan="6" | MFM

| 720 kB

rowspan="3" | High

| 15

| 1,200 kB

| rowspan="2" | 3-modeThe PC98 3{{frac|1|2}}-inch (90 mm) formats are also known as "3 Mode" floppy disks, usable on IBM PC compatibles with a 3-mode floppy drive.

77 (80)

| 8

| 1,024

| 1,232 (1,280) kB

| 18

| 512

| 1.44 MB

| 300

Triple

| 240

| 38

| 512

| 9,120 kB

| 360

| NEC PC-88 VA3 2TD drive only

rowspan=2| Osborne 1{{cite book |last1=Hogan |first1=Thom |url=http://www.bitsavers.org/pdf/osborne/osborne1/2F00153-01_Osborne1TechnicalManual_1982.pdf |title=Osborne 1 Technical Manual |last2=Iannamico |first2=Mike |date=1982 |publisher=Osborne Computer Corporation |page=39}}

|rowspan=2| 5{{frac|1|4}} inch

| Single

| rowspan="2" |1

| rowspan="2" |40

|10

| 256

| rowspan="2" |Soft

| 100 kB

|rowspan=2| 300

| FM

Double

| 1,024

| 200 kB

| MFM

Sega SF-7000

| 3 inch

| Single

| 2

| 40

| 16

| 256

| 160 kB

| ?

| Expansion unit for SC-3000 home computer. Capacity is per side.

{{cite web | url=https://archive.org/stream/sega-sf-7000-super-control-station/sega-sf-7000-super-control-station_djvu.txt | title=Sega SF-7000 Super Control Station User Guide | publisher=Sega Enterprises | accessdate=2020-02-10}}

rowspan=2 | SHARP X68000

| 5{{frac|1|4}} inch

| rowspan="2" | High

| rowspan="2" | 2

| rowspan="2" | 77

| rowspan="2" | 8

| rowspan="2" | 1,024

| rowspan="2" | 1,232 kB

| rowspan="2" | 360

| rowspan="2" | MFM

| rowspan="2" |

3{{frac|1|2}} inch

SHARP CE-1600F, CE-140F

| 2{{frac|1|2}} inch

| Single

| drive: 1, diskette: 2 (flippable)

| 16

| 8

| 512

| 2× 64 kB

| 270

| GCR (4/5)

| Internally based on FDU-250 Micro Floppy Disk Drive Unit

rowspan="4" | Thomson

| rowspan="2" | 5{{frac|1|4}} inch

| Single

| 1

| rowspan="2" | 40

| rowspan="2" | 16

| 128

| 80 kB

| rowspan="2" | 300

| FM

| Thomson UD90.070

Double

| 2

| 256

| 320 kB

| MFM

| Thomson DD90-320The two sides are managed as two independent 160 KB disks

rowspan="2" | 3{{frac|1|2}} inch

| Double

| 1

| rowspan="2" | 80

| rowspan="2" | 16

| rowspan="2" | 256

| 320 kB

| rowspan="2" | 300

| rowspan="2" | MFM

| Thomson TO9, Thomson DD09-350

rowspan="1" | Double

| 2

| 640 kB

| Thomson TO8D, TO9+, Thomson DD90-352The two sides are managed as two independent 320 KB disks

rowspan="2" | Victor 9000 / ACT Sirius 1{{cite web|url=http://bitsavers.org/pdf/victor/victor9000/Victor_9000_Hardware_Reference_Manual_1983.pdf |title=Victor 9000 Hardware Reference Manual |access-date=2022-09-12 | archive-url=https://web.archive.org/web/20220129140512/http://bitsavers.org/pdf/victor/victor9000/Victor_9000_Hardware_Reference_Manual_1983.pdf | archive-date=2022-01-29 |url-status=live}}

| rowspan="2" |5{{frac|1|4}} inch

|Single

| rowspan="2" |80

| rowspan="2" |11-19 (variable)

|512

|612 kB{{cite news |url=https://archive.org/stream/byte-magazine-1982-11/1982_11_BYTE_07-11_Graphics#page/n241/mode/2up |title=Victor Victorious |work=BYTE |date=November 1982 |access-date=2013-10-19 |author-last=Lemmons |author-first=Phil |page=216}}

| rowspan="2" |252-417 (variable)

| rowspan="2" |GCR

| rowspan="2" |Disks varied sectors/track and disk speed to keep consistent bit density across tracks

Double

|512

|1,196 kB

rowspan="7" |Tandy TRS-80

|5{{frac|1|4}} inch

|Single

|35

|10

|256

| rowspan="7" |Soft

|88 kB

| rowspan="7" |300

|FM

|Model 1/3/4

5{{frac|1|4}} inch

|Double

|40

|18

|256

|180 kB

|MFM

|Model 1/3/4P

5{{frac|1|4}} inch

|Double

|40

|18

|256

|360 kB

|MFM

|Model 4D

8 inch

|Double

|77

|26

|256

|500 kB

|MFM

|Model 2

3{{frac|1|2}} inch

|Single

|40

|1,280

|100 kB{{Cite book |last= |url=https://archive.org/details/TandyPortableDiskDriveOperationManual26-3808/page/n27 |title=Tandy Portable Disk Drive Operation Manual 26-3808 |publisher=Radio Shack |year=1985 |location=Japan |pages=25}}

|FM

|Tandy Portable Disk Drive (aka Brother FB-100, knitking FD-19)

3{{frac|1|2}} inch

|Single

|80

|1,280

|200 kB{{Cite book |url=http://archive.org/details/Portable_Disk_Drive_2_Operation_Manual_1986_Tandy |title=Tandy Portable Disk Drive 2 Operation Manual 26-3814 |publisher=Radio Shack |year=1986 |location=Japan |pages=33}}

|FM

|Used only in Tandy Portable Disk Drive 2

5{{frac|1|4}} inch

|Double

|35

|18

|256

|157 kB{{Cite book |url=http://archive.org/details/Color_Computer_Disk_System_Owners_Manual_1981_Tandy |title=Radio Shack Hardware Manual: Color Computer Disk System Owners Manual (1981)(Tandy) |date=1981}}

|MFM

|Color Computer

HP 9114A

|3{{frac|1|2}} inch

|Double

|80

|16

|256

|128-710kB{{Cite book |url=http://www.bitsavers.org/pdf/hp/disc/5957-6657_9914A_Disc_Drive_Jun84.pdf |title=9914A Disc Drive |publisher=Hewlett-Packard |publication-date=1 June 1984 |page=1-2 |language=en}}

|600

|MFM

|Used with HP 110 and Portable Series 40 & 70

HP 9895A

|8 inch

|Double

|77

|29

|256

|1.18 MB{{Cite book |url=http://www.bitsavers.org/pdf/hp/disc/09895-90000_9895A_Flexible_Disc_Users_Man_Sep79.pdf |title=9895A Flexible Disc Users Manual |publisher=Hewlett-Packard Desktop Computer Division |year=1978 |location=Fort Collins, Colorado USA |pages=6 |language=en}}

|360

|MFM

HP 9130K

|5{{frac|1|4}} inch

|Double

|35

|16

|256

|286 kB{{Cite book |url=http://www.bitsavers.org/pdf/hp/disc/09130-90030_9130K_Service_Jul81.pdf |title=HP 9130K Flexible Disc Drive Service Documentation |publisher=Hewlett-Packard Greeley Division |year=1981 |location=Fort Collins, Colorado USA |language=en}}

|300

|MFM

Burroughs MD122

|8 inch

|Double

|139

|44

|256

|Soft

|6.26 MB{{Cite book |url=http://archive.org/details/bitsavers_burroughsD003MD122BrochureNov1979_1775811 |title=Burroughs MD 122 Brochure |publisher=Burroughs Marketing |year=1979 |location=USA |pages=2 |language=en}}

|524

|MFM

Memorex 650

| rowspan="2" |8 inch

|Single

| rowspan="2" |1

|50

|3,500 b

| rowspan="2" |Hard

|1.4 Mb

| rowspan="2" |375

| rowspan="2" |FM

Memorex 651

|Single

|64

|32

|1.056 b

|2.2 Mb

class="wikitable"

!Platform

!Size

!Density

!Side

!Track

!Sector

!Byte

!Sectoring

!Capacity

!RPM

!Encoding

!Note

Commodore 128 (CP/M)

|5 1/4

|Double

|40

|26

|128

|Soft

|260K

|300

|MFM

|Commodore 1571

|16

|256

|320K

|512

|360K

|1,024

|400K

https://www.c64-wiki.com/wiki/Commodore_1571

https://vintagecomputer.ca/files/Commodore/C900/C900%20Floppy%20Specification.pdf

Notes

References

{{reflist|refs=

{{Cite book |title=The MS-DOS Encyclopedia: versions 1.0 through 3.2 |author-first1=Ray |author-last1=Duncan |author-first2=Steve |author-last2=Bostwick |author-first3=Keith |author-last3=Burgoyne |author-first4=Robert A. |author-last4=Byers |author-first5=Thom |author-last5=Hogan |author-first6=Jim |author-last6=Kyle |author-first7=Gordon |author-last7=Letwin |author-link7=Gordon Letwin |author-first8=Charles |author-last8=Petzold |author-link8=Charles Petzold |author-first9=Chip |author-last9=Rabinowitz |author-first10=Jim |author-last10=Tomlin |author-first11=Richard |author-last11=Wilton |author-first12=Van |author-last12=Wolverton |author-first13=William |author-last13=Wong |author-first14=JoAnne |author-last14=Woodcock |contribution=Technical advisors |contributor-first1=Mark |contributor-last1=Zbikowski |contributor-link1=Mark Zbikowski |contributor-first2=Paul |contributor-last2=Allen |contributor-link2=Paul Allen |contributor-first3=Steve |contributor-last3=Ballmer |contributor-link3=Steve Ballmer |contributor-first4=Reuben |contributor-last4=Borman |contributor-first5=Rob |contributor-last5=Borman |contributor-first6=John |contributor-last6=Butler |contributor-first7=Chuck |contributor-last7=Carroll |contributor-first8=Mark |contributor-last8=Chamberlain |contributor-first9=David |contributor-last9=Chell |contributor-first10=Mike |contributor-last10=Colee |contributor-first11=Mike |contributor-last11=Courtney |contributor-first12=Mike |contributor-last12=Dryfoos |contributor-first13=Rachel |contributor-last13=Duncan |contributor-first14=Kurt |contributor-last14=Eckhardt |contributor-first15=Eric |contributor-last15=Evans |contributor-first16=Rick |contributor-last16=Farmer |contributor-first17=Bill |contributor-last17=Gates |contributor-link17=Bill Gates |contributor-first18=Michael |contributor-last18=Geary |contributor-first19=Bob |contributor-last19=Griffin |contributor-first20=Doug |contributor-last20=Hogarth |contributor-first21=James W. |contributor-last21=Johnson |contributor-first22=Kaamel |contributor-last22=Kermaani |contributor-first23=Adrian |contributor-last23=King |contributor-first24=Reed |contributor-last24=Koch |contributor-first25=James |contributor-last25=Landowski |contributor-first26=Chris |contributor-last26=Larson |contributor-first27=Thomas |contributor-last27=Lennon |contributor-first28=Dan |contributor-last28=Lipkie |contributor-first29=Marc |contributor-last29=McDonald |contributor-link29=Marc McDonald |contributor-first30=Bruce |contributor-last30=McKinney |contributor-first31=Pascal |contributor-last31=Martin |contributor-first32=Estelle |contributor-last32=Mathers |contributor-first33=Bob |contributor-last33=Matthews |contributor-first34=David |contributor-last34=Melin |contributor-first35=Charles |contributor-last35=Mergentime |contributor-first36=Randy |contributor-last36=Nevin |contributor-first37=Dan |contributor-last37=Newell |contributor-first38=Tani |contributor-last38=Newell |contributor-first39=David |contributor-last39=Norris |contributor-first40=Mike |contributor-last40=O'Leary |contributor-first41=Bob |contributor-last41=O'Rear |contributor-link41=Bob O'Rear |contributor-first42=Mike |contributor-last42=Olsson |contributor-first43=Larry |contributor-last43=Osterman |contributor-first44=Ridge |contributor-last44=Ostling |contributor-first45=Sunil |contributor-last45=Pai |contributor-first46=Tim |contributor-last46=Paterson |contributor-link46=Tim Paterson |contributor-first47=Gary |contributor-last47=Perez |contributor-first48=Chris |contributor-last48=Peters |contributor-first49=Charles |contributor-last49=Petzold |contributor-link49=Charles Petzold |contributor-first50=John |contributor-last50=Pollock |contributor-first51=Aaron |contributor-last51=Reynolds |contributor-link51=Aaron R. Reynolds |contributor-first52=Darryl |contributor-last52=Rubin |contributor-first53=Ralph |contributor-last53=Ryan |contributor-first54=Karl |contributor-last54=Schulmeisters |contributor-first55=Rajen |contributor-last55=Shah |contributor-first56=Barry |contributor-last56=Shaw |contributor-first57=Anthony |contributor-last57=Short |contributor-first58=Ben |contributor-last58=Slivka |contributor-first59=Jon |contributor-last59=Smirl |contributor-first60=Betty |contributor-last60=Stillmaker |contributor-first61=John |contributor-last61=Stoddard |contributor-first62=Dennis |contributor-last62=Tillman |contributor-first63=Greg |contributor-last63=Whitten |contributor-first64=Natalie |contributor-last64=Yount |contributor-first65=Steve |contributor-last65=Zeck |date=1988 |edition=Completely reworked |publisher=Microsoft Press |location=Redmond, Washington, USA |isbn=1-55615-049-0 |lccn=87-21452 |oclc=16581341}} (xix+1570 pages; 26 cm) (NB. This edition was published in 1988 after extensive rework of the withdrawn 1986 first edition by a different team of authors. [https://www.pcjs.org/pubs/pc/reference/microsoft/mspl13/msdos/encyclopedia/])

}}

{{cite book |title=The IBM Diskette General Information Manual |url=http://bitsavers.trailing-edge.com/pdf/ibm/floppy/GA21-9182-4_Diskette_General_Information_Manual_Aug79.pdf |edition=Fifth |series=Product Reference Literature |date=August 1979 |publisher=IBM}}
{{cite web |title=RX02 8 inch Floppy Drive Information |url=http://www.pdp8online.com/rx02/rx02.shtml?med |publisher=David Gesswein |access-date=2007-09-21}}
{{cite web|title=8 inch floppy disks|url=https://ub.fnwi.uva.nl/computermuseum/diskettes.php|url-status=live|publisher=University of Amsterdam|archive-url=https://web.archive.org/web/20160702204635/https://ub.fnwi.uva.nl/computermuseum/diskettes.php|archive-date=July 2, 2016|access-date=2015-04-19}}

External links

{{commons-inline|Floppy disk}}
[https://obsoletemedia.org/data/disk/#fd Floppy Disk Formats] at the Museum of Obsolete Media

Category:Legacy hardware

Category:Floppy disk computer storage

List of floppy disk formats

Physical formats

Logical formats

See also

Notes

References

External links