February 2011 - Fdutils

Question about how to identify floppy format ("http://fdutils.linux.lu/disk-id.html")
by Mark Hounschell 24 Feb '11

24 Feb '11

" Finding out the data transfer rate First, you need to find out the data transfer rate (roughly the density: high, double, single). For this, you try out fdrawcmd readid 0 rate=x, where x is 0, 1, 2, 3 If no rate is supplied, fdrawcmd assumes rate=0 " My question: How do the numbers 0,1,2, and 3 relate to the densities of high, double, and single? There are 4 numbers and only 2 densities. Thanks Mark

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Re: [Fdutils] Question about how to identify floppy format
by John Elliott 23 Feb '11

23 Feb '11

> My question: How do the numbers 0,1,2, and 3 relate to the densities of > high, double, and single? There are 4 numbers and only 2 densities. <http://fdutils.linux.lu/Fdutils.html> explains: dtr-code rate for FM rate for MFM ============================================= 0 250kb/s 500kb/s 1 150kb/s 300kb/s 2 125kb/s 250kb/s 3 500kb/s 1000kb/s "Single Density" is MFM, 125 kb/s. "Double Density" and "quad Density" are MFM, 250 kb/s. "High Density" is MFM at 500kb/s. The 300kb/s rate (number 1) is used on 8" drives and 1.2Mb 5.25" drives, and the 1000kb/s rate (number 3) on 2.8Mb drives. -- John Elliott

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R/W 8" drives, 128 byte sectors, aka CP/M disks?
by Nick Papadonis 04 Feb '11

04 Feb '11

Hi Folks, Does anyone know if this has been completed or attempted? Something similar to what DOS ImageDisk or 22DISK does? I would like to interface my 8" floppy drives to a modern Linux box for imaging. Insight is appreciated. Please reply directly as I'm not subscribed to this mailing list yet. Thanks, Nick

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