CDC WREN IV is Lying!!!

Heiko Blume src at scuzzy.mbx.sub.org
Fri Aug 24 01:54:44 AEST 1990


heiser at tdw201.ed.ray.com writes:
>>[using]
>>one spare 512 byte sector per track (or perhaps they meant cylinder?) results
>>in a 301MB drive.

>How does one change this so as to use the "full capacity" of the drive?
>Why is it set up this way (what is the technical reason for it)?

you have to talk to the disk using a utility like 'scsicntl.exe' from roy neese
(he's at adaptec and the utility only works with adaptec host adapters)
to issue the proper mode select commands to the drive. you can set a lot
of very interesting parameters that can affect throughput dramatically.
especially read-ahead buffers and caches are *disabled* by default in many
drives.
i have posted a long description of many of these parameters (for disk drives)
to comp.periphs.scsi some weeks ago.
i also have the above mentioned software, but i'm in germany so you'd better
look elsewhere first.

-- 
Heiko Blume c/o Diakite   blume at scuzzy.mbx.sub.org    FAX   (+49 30) 882 50 65
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