[BBC-Micro] Hard or Soft Sectored Drives
BBCMailingList at beebmaster.co.uk
Fri Dec 22 21:48:45 GMT 2006
Thanks for all the info on this. Reading a bit further
into the Adaptec manual and trying a few things out,
it seems like the Adaptec controller doesn't allow you
to set the number of sectors per track explicitly for
soft-sectored drives, it uses a preset number based
on the bytes-per-sector size specified. So if it's 256
for use with ADFS, the number of sectors per track
will be 33 and if you change the sector size to 512
with a mode select command, mode sense will then
report a sectors per track value of 17.
----- Original Message -----
From: Pete Turnbull [mailto:pete at dunnington.plus.com]
To: bbc-micro at lists.cloud9.co.uk
Sent: Fri, 22 Dec 2006 13:29:24 +0000
Subject: Re: [BBC-Micro] Hard or Soft Sectored Drives
Andrew Benham wrote:
> I thought the original query was about hard sectored
> HARD disks, not floppies ?
> I've found some references to hard sectored EDSI drives,
> but not to ST506 ones.
Yes, ST506/416 drives are pretty simple devices, but some controllers
have fixed ideas about sectors, and some SCSI and SMD drives are
> Superform issues the "format unit" SCSI command
> as I recall, rather than formatting tracks or
> cylinders or sectors.
Ah yes, that's right -- I misremembered.
Pete Peter Turnbull
University of York
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