Fdutils January 2011

fdutils@fdutils.linux.lu

7 participants
4 discussions

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

4 4

Reading dodgy old HD 5.25" disks
by Ian Oliver 17 Jan '11

17 Jan '11

> Will fdrawcmd let me ignore CRCs and just got whatever is there? Hmmm, some sniffing around suggests that these disks have a proprietary format. The first cylinder is normal, but after that, the next 21 cylinders don't even have a sector 0. I suspect there are 14 sectors of non-standard sizes, so this is all going to be great fun. Regards Ian

4 12

Re: [Fdutils] Reading dodgy old HD 5.25" disks
by John Elliott 16 Jan '11

16 Jan '11

> What system were they from? That might be helpful to list readers (or yield > someone with a working system that can read them "natively") > > > The first cylinder is normal, but after that, the next 21 cylinders don't > > even have a sector 0. If the discs were formatted with a WD17xx series controller, it's possible that the first sector is too close to the index hole for the PC's floppy controller to detect. <http://z80cpu.eu/archive/news/comp.os.cpm/threads/49581d115e7ce5d6.html> <http://simonowen.com/samdisk/faq/> -- John Elliott

2 2

Reading dodgy old HD 5.25" disks
by Ian Oliver 11 Jan '11

11 Jan '11

Hi, I have some old (20 years+) floppies that I'm trying to read. ddrescue has got the good sectors off, so now I need to work on the problem cases. Will fdrawcmd let me ignore CRCs and just got whatever is there? Is there any way to play with things like precomp? Lots of my disks are OK at the start but hard to read at the end. Any/all advice is very welcome. Regards Ian

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Fdutils January 2011