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On Thu, 6 Sep 2001 09:32:25 -0600, Jim Castleberry wrote:
>1. On a huge drive, is a READ SECTORS starting at LBA 2^28-5 and going
> for 10 sectors guaranteed to give the same result as a READ SECTORS
> EXT with the same start and length, i.e. is the device required to
> support 28-bit commands that span the 28-bit boundary?
I think the drive should error (ERR=1 IDNF=1) the 28-bit READ SECTORS
because it is attempting to read LBAs that are not addressable by a
28-bit command. This is no different than trying to read past the end
of the drive when the drive is only a 40GB drive, it is an "LBA range
error" that should get an IDNF error.
>2. Why is there no SEEK EXT?
I think it is because no one could think of a good reason to continue
supporting the SEEK command. No one knows of any OSs that use the
command and continuing to support it just for some stupid
"performance measurement" programs is not a good enough reason.
*** Hale Landis *** [EMAIL PROTECTED] ***
*** Niwot, CO USA *** www.ata-atapi.com ***
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