SCSI sector size

allison ajp166 at
Fri Dec 10 05:59:35 CST 2010

On 12/09/2010 05:00 PM, Simon Fryer wrote:
> Hi,
> On 10/12/2010, Alexandre Souza - Listas<pu1bzz.listas at>  wrote:
>>      Sirs,
>>      I have some old systems (sun, SGI, commodore, etc) and some new systems
>> (PC, whatever). For all those systems I have few SCSI drivers. Should I
>> include on external SCSI boxes with CD-ROMs and DVD-ROMs a switch for
>> changing the SCSI sector size or can I keep everything on 512 bytes which
>> seems to be the more common?
> Personally, I add switches just in case. It is good insurance so that
> you will never need to use it! :)
> Following on from this I expect the usual discussion about 512 / 2048
> byte blocks, the actual format of the CD / DVD and where the 2048<->
> 512 byte conversion is done.
> Simon

However if your replacing a older SCSI to MFM bridge you need to
do 256bytes.

Note: scsi makes no assumption of sector size, that is a device thing
and tapes can be far larger (DLT 16K or larger).


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