Topic summary
Superfloppy
Extracted from the Wikipedia article Floppy disk.
References
- ^ 2024.
- ^ 315. doi:10.1109/9780470545201.ch19. ISBN 2025.
Forecasts indicated that only 10% of the total number of flexible disk drives marketed in 1997 would be of the high-capacity or superfloppy type.
- ^ 2024.
- ^ 2017.
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- ^ 2020.
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- ^ The figure shows the relative success of each generation
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- ^ 2025.
- ^ 2022,
Information Systems – Unformatted Flexible Disk Cartridge for Information Interchange, 5.25 in (130 mm), 96 Tracks per inch (3.8 Tracks per Millimeter), General, Physical, and Magnetic Requirements (includes ANSI X3.162/TC-1-1995) Specifies the general, physical, and magnetic requirements for interchangeability for the two-sided, 5.25 in (130 mm) flexible disk cartridge
- ^ . Apple II Documentation Project 2025.
GCR disks cannot be read by standard PC disk controllers.
- ^ 2015.
- ^ 2012.
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- ^ 2013.
- ^ 2014.
- ^ . IBM. 1974. p. 2. Archived(PDF) from the original on 15 February 2017 2019 – via Stuttgart University.
The diskette is about 8" (20 cm) square and has a net capacity of 1898 128-character records – about one day's data entry activity. Each of the diskette's 73 magnetic recording tracks available for data entry can hold 26 sectors of up to 128 characters each.
- ^ 7. Archived from the original on 24 November 2016 2013.
- ^ 2014.
- ^ 2025.
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- ^ 2025.
So the short story is don't write a double density diskette in a high density drive and then expect a double density drive to be able to read it. The narrower write head overwriting the wider preexisting data can confuse the wider drive head
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- ^ 54 2024.
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- ^ Reports Sony shipped in 1Q 1986
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- ^ 2025.
There were in fact 'hard' protected disks - such that simply had no write protect hole. These were used by software distributions
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- ^ 2011.
- ^ 2023.
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- ^ 2018.
- ^ 2018.
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- ^ 2012.
- ^ 2011.
- ^ 2011.
- ^ . Report to Congressional Requesters. United States Government Accountability Office. May 2016. Archived(PDF) from the original on 2 June 2016 2016.
- ^ 2016.
- ^ 2025.
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- ^ 2019.
- ^ 2021.
- ^ 2022.
- ^ 2022.
- ^ 'Last man standing in the floppy disk business' reckons his company has 4 years left". The Register 2022.
- ^ 2022.
Turns out the obsolete floppy is way more in demand than you'd think. ... I expect to be in this business for at least another four years.
- ^ 2025.
- ^ 2025.
- ^ 2025.
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- ^ 2018.
Wozniak's technique would allow the drive to do self-synchronization ("soft sectoring"), not have to deal with that little timing hole, and save on hardware.
- ^ 2017.
- ^ 2025.
Extra Density (ED): Consists of 3 μm barium ferrite
- ^ 2025.
ISO 838 specifies that, for filing purposes, two holes of 6±0.5 mm diameter can be punched into the sheets. The centers of the two holes are 80±0.5 mm apart
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- ^ (Report). Brier Technology. 1989. Archived from the original on 15 August 2023 2025.
Enhanced electronics permit the BR-3225 to read IBM formatted 3.5 inch floppy disks. The drive automatically identifies 1 MB, 2 MB, or 25 MB disks… Servo: magnetically embedded (buried).
{{}}: CS1 maint: bot: original URL status unknown () - ^ 2017.
[…] The Brier ... can store 20 megabytes, increase the number of tracks. […] In Brier's Flextra system, a low-frequency magnetic homing signal is embedded at the bottom of the barium ferrite coating after the disk is manufactured. Later, the data are recorded in the top of the layer, using a higher-frequency signal. The Brier system cannot read and write lower-capacity disks, although the company says it will introduce a model that can do that later this year. […] Brier has designed its system from scratch to achieve higher speeds.
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{{}}: CS1 maint: deprecated archival service () - ^ . p. 31. Archived from the original(PDF) on 13 May 2015 2011.
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- ^ 2025.
- ^ 2025.
It is also a good idea on real hardware to retry a disk operation a few times if it fails. You can do that by calling BIOS function Int 13h/AH=0 (Disk Reset) before retrying the operation again. If it fails more than a few times then you can abort
- ^ 2025.
Similarly, CP/M would repeatedly read or write a disk sector as long as there was an error
- ^ 2025.
A floppy disk drive mechanism includes a clamping lever which is turned to align the floppy disk with a drive spindle and clamp it thereto
- ^ 2025.
A system of levers that opens the little protective window on the diskette to allow the read/write heads to touch the dual-sided diskette media
- ^ 2025.
Because of spring loading, the linkages involved with insertion and clamping of the disk provide a force, upon release, by pushing the release button, that strikes against the rear edge of the cartridge containing said disk and applies an ejection force thereto
- ^ 2025.
Floppy disk drives for Macintosh computers have an electric ejecting mechanism, so there is no eject button on Macintosh floppy disk drives
- ^ 2025.
It's not a mechanical eject button - it's an electrical switch, so the Mac itself has to "respond" not the drive
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{{}}: CS1 maint: bot: original URL status unknown () - ^ 2025.
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- ^ . Howard W. Sams & Co.
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- ^ 710. doi:10.1147/rd.255.0701.
- ^ . Archived from the original(PDF) on 25 July 2011 2011.
- ^ 66. Bibcode:1978ITM....14..160S. doi:10.1109/TMAG.1978.1059748. ISSN 0018-9464. S2CID 32505773.
- ^ 2011.
- ^ . PET User Notes. Vol. 2, no. 1. Montgomeryville, Pennsylvania. p. 2. Archived(PDF) from the original on 11 June 2016 2018.
- ^ 2018.
- ^ 2018.
- ^ . Archived(PDF) from the original on 29 January 2022 2022.
- ^ 2008.
- ^ . Archived from the original(PDF) on 8 August 2012 2008.
- ^ 2022.
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- ^ . Sharp PC-1600 Service Manual. Yamatokoriyama, Japan: Sharp Corporation, Information Systems Group, Quality & Reliability Control Center. July 1986. pp. 98–104. Archived(PDF) from the original on 23 March 2017 2017.
- ^ . Sharp Corporation. 00ZCE140F/SME. Archived(PDF) from the original on 11 March 2017 2017.
- ^ 2018.
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- ^ 2011.
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- ^ (Application Note) (2 ed.). Intel Corporation, IMD Marketing. AP-358, 292093-002. Archived(PDF) from the original on 19 June 2017 2017.
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- ^ 2025.
- ^ 2013.
- ^ 2025.
data frequency 250Kbps, MFM double density DD / 500Kbps, MFM high density HD / 1Mbps, ?MFM?? 2.88M extended density ED
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- ^ 2011.
- ^ 2026.