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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!wupost!darwin.sura.net!convex!egsner!adaptex!adaptx1!neese
- From: neese@adaptx1.UUCP (Roy Neese)
- Subject: Re: SCSI controllers & int 13h bios call
- Organization: Adaptec Inc., Texas
- Date: Fri, 14 Aug 1992 19:29:04 GMT
- Message-ID: <1992Aug14.192904.13980@adaptx1.UUCP>
- Keywords: Adaptec SCSI
- References: <gburke.713693365@unix2.tcd.ie>
- Lines: 26
-
- In article <gburke.713693365@unix2.tcd.ie> gburke@unix2.tcd.ie (Garrett Burke) writes:
- > Hi All,
- > Could any of you SCSI gurus out there please confirm this:
- >
- > Page 7-5 of the Adaptec AHA-1740A/1742A/1744 Tech. Ref. Man. states:
- >
- > 'SCSI devices are addressed by logical block address without regard to
- > the physical geometry of the disk. For this reason, all SCSI devices are
- > ^^^
- > defined as drives with 64 heads and 32 sectors/track'
- > ^^ ^^
- >
- > Q: Can I take this as true i.e use #define HEADS 64 etc when writing
- > software for creating boot blocks?
- >
- > From experience it seems to be true and would make things easier to do.
-
- This is something you cannot garantee. Various adapters use different
- translation schemes and we have changed ours to allow disks greater than
- 1GB to be used under BIOS control.
- ---
-
- Roy Neese
- Adaptec Senior UNIX/SCSI Software Engineer
- UUCP: convex!egsner!adaptex!neese
- Inet: neese%adaptex@cirr.com
-