ArVid

• Using low-cost VHS tapes and recording units for data backup.
• High reliability
• Hamming code error correction
• Easy data copying between two VHS units (eliminating need of a computer for data copying)

• Inefficient tape capacity usage (only 2 grades of luminance signal spectrum were used)
• Poor software support

A VHS recorder unit should be connected to an ArVid ISA board by a composite video cable. Unit operation is controlled by a remote control emulator using an LED.

Device may operate in two modes: low data rate at 200 KB/s and high data rate at 325 KB/s (equivalent to roughly 1.33× and 2.17× CDR recording speed). The original, lower recording speed was retained as a user option because not all VHS recorders of the time offered sufficient recording quality to reliably support the higher speed.

An E-180 video tape is able to hold 2 GB of uncompressed data at the lower rate, more than sufficient for most PC hard drives of the time. This can be shown by calculating 200 KB/s × 60 s/min × 60 min/h × 3 h = 2.06 GB (2.06 × 2³⁰ bytes), which also leaves a few minutes spare for header and synchronisation space.

Note that it is unclear here whether "200 kbyte" means {{val|200,000}} (200 × 10³) or {{val|204,800}} (200 × 2¹⁰); the above calculation assumes the latter, but the former still produces a capacity of 2.01 GB (2.01 × 2³⁰ bytes), providing 2.00 GB of capacity in a little under 2 hours and 59 minutes. Similarly, this means that an E240 4-hour tape, using the higher data rate, would be capable of storing between 4.35 and 4.46 GB (2³⁰ bytes), approximately equivalent to a standard single-layer recordable DVD.

• ArVid 1010, 100 kbyte/s, 4 kbyte RAM,http://andy.sumy.ua/old_computers/world_museum/detali_ussr.htm {{Webarchive|url=https://web.archive.org/web/20210905233500/http://andy.sumy.ua/old_computers/world_museum/detali_ussr.htm |date=2021-09-05 }} {{in lang|ru}} was first of ArVid devices. Its production started in 1992.
• ArVid 1020, 200 kbyte/s, no RAM, was a successor to ArVid 1010 using more advanced integrated circuitry.
• ArVid 1030/1031, 200 kbyte/s, 64 kbyte RAM, had better internal design, less power consumption, was smaller in size and was made using CPLD. It allowed automatic switching to a TV set when device was not in use.
• ArVid 1051/1052, 325 kbyte/s, 128/512 kbyte RAM

{{Commons category|ArVid}}

• {{cite web |url=http://oldhard.hotmail.ru/pc/arvid/arvid.htm |title=ArVid documentation |language=Russian |archiveurl=https://web.archive.org/web/20050207182321/http://oldhard.hotmail.ru/pc/arvid/arvid.htm |archivedate=2005-02-07}}
• [http://phantom.sannata.ru/articles/arvid.shtml ArVid description and images (in Russian)]
• [http://195.5.147.100/software.html Drivers for linux and FreeBSD] {{Dead link|date=October 2009}}
• {{cite web | url=http://www.pentahd.redline.ru/arvlinux/ |title=Drivers for Linux |language=Russian |archiveurl=https://web.archive.org/web/20110518153645/http://www.pentahd.redline.ru/arvlinux/ |archivedate=2011-05-18}}
• {{cite web |url=http://faqs.org.ru/hardw/storage/arvidfaq.htm |title=Arvid FAQ |archiveurl=https://web.archive.org/web/20130319085844/http://faqs.org.ru/hardw/storage/arvidfaq.htm |archivedate=2013-03-19}}

{{Magnetic tape data formats}}

Category:VHS

Category:Computer storage devices