On Fri, 7 Feb 2003 18:40:24 +0000 (GMT), William Palfreman wrote:

>On Fri, 7 Feb 2003, northern snowfall wrote:
>
>>  Morning, all;
>>      I'm trying to get a Mitsumi D509V3 1.2MB 5.25" floppy drive
>>  to work on FreeBSD 4.2.6.
>
>Cool.  My father still has a 5.25" drive in production use - he has
>large numbers of 5.25 disks containing old work, and maybe once a
>year needs something off one of them.  Works fine on his W2k box.
>
>> The operating system reports the drive
>>  is available and definitely makes contact with the drive (visual
>>  confirmation: LED). The issue is during read/write from the
>>  drive. Error message:
>>      fd0c: hard error reading fsbn 0 (No status)
>>  I have the proper drive type set in the BIOS. FreeBSD seems to
>>  agree according to the dmesg:
>>      fd0: <1200-KB 5.25" drive> on fdc0 drive 0
>>  I've been doing simple read tests using:
>>      dd if=/dev/fd0 count=1 bs=512 | hexdump ;
>>  Any suggestions?
>
>Drive might be broken, disk might be broken, disk might not be
>formated, and finally make sure you know what kind of 5.25 both the
>drive and the disk are. 8088/86 machines stated off with single sided 8
>sector one @160k, then double sided 8 sector (320k), then single sided 9
>sector (180k), then double sided 9 sector (360k).  That was the
>standard.  AT machines (i.e. 286s and later 386s & 486s) used 1.2Mb
>5.25" disks.  These AT drives could read 360k PC disks (PC = 8086/88,
>BTW) but if you wrote to one there was a very good chance it would never
>be readable by a PC again, because the 1.2Mb AT drive had a read/write
>head 1/3 of the size of the 360Kb PC drive, and often the mark it left
>was too small to be read by larger PC heads.  For that reason I always
>treated 360k disks as read-only media on 1.2Mb drives.

correct; however, you can also format a 360K disk as a 360K High
Density, so you could read or write to it from a 1.2M, and still read
it from a 360k (but not write).

---
doug reynolds | the maverick | [EMAIL PROTECTED]



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