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- Newsgroups: comp.sys.ibm.pc.hardware
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cs.utexas.edu!csc.ti.com!tilde.csc.ti.com!mksol!mccall
- From: mccall@mksol.dseg.ti.com (fred j mccall 575-3539)
- Subject: Re: Adaptec 1542B Question
- Message-ID: <1992Dec17.142217.21046@mksol.dseg.ti.com>
- Organization: Texas Instruments Inc
- References: <1992Dec5.174057.9886@udel.edu> <1992Dec09.194049.7866@adaptx1.UUCP> <85479@ut-emx.uucp>
- Date: Thu, 17 Dec 1992 14:22:17 GMT
- Lines: 35
-
- In <85479@ut-emx.uucp> ifai645@ccwf.cc.utexas.edu (Paul C. Janzen) writes:
-
- >In article <1992Dec09.194049.7866@adaptx1.UUCP> neese@adaptx1.UUCP (Roy Neese) writes:
- >>Do not use this upgrade package if you intend on using another OS other
- >>than DOS as most of the non-DOS drivers are canned to use the 64 head by
- >>32 sector translation.
-
-
- >I thought that most Unices (for the 386) popped into protected mode
- >and ignored the Bios translation after that. So it doesn't really
- >matter what translation you pick: the driver talks to the SCSI drive
- >in a fundamentally different manner than BIOS. I know that this is the
- >case for Linux. The only software that cares about the head/sector
- >translation is the partitioning software and the boot-from-harddisk
- >software.
-
- Well, first of all, let me say that I heard this from a Senior
- Engineer at Adaptec. Now, let me see if I can clear up my butchering
- of his statements. The problem is that most of the Adaptec drivers
- (that are built into OS/2, Windows/NT, various Unices) expect the
- CONTROLLER ROM to be doing that mapping. If you change the Adaptec
- controller ROM so you can get greater than 1G drives under DOS, there
- is apparently a new DOS driver set that they give you with it (I'm
- guessing about that one -- the current version of the drivers for DOS
- may understand this one). However, for other operating systems, the
- drivers built into the OS for the controller will break if you change
- the controller ROM to change the head mapping.
-
- [I don't know if I've made it better or worse.]
-
- --
- "Insisting on perfect safety is for people who don't have the balls to live
- in the real world." -- Mary Shafer, NASA Ames Dryden
- ------------------------------------------------------------------------------
- Fred.McCall@dseg.ti.com - I don't speak for others and they don't speak for me.
-