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- Xref: sparky comp.os.msdos.programmer:9117 comp.os.msdos.misc:5073
- Path: sparky!uunet!spool.mu.edu!uwm.edu!linac!att!princeton!rutgers!psinntp!psinntp!newstand.syr.edu!rodan.acs.syr.edu!amichiel
- From: amichiel@rodan.acs.syr.edu (Allen J Michielsen)
- Newsgroups: comp.os.msdos.programmer,comp.os.msdos.misc
- Subject: Re: Disk Drive Purchase?
- Message-ID: <1992Sep6.130707.2409@newstand.syr.edu>
- Date: 6 Sep 92 17:07:06 GMT
- References: <1992Aug28.144538.1@ttd.teradyne.com> <1992Sep2.220649.11769@newstand.syr.edu> <Bu34nA.3FB.2@cs.cmu.edu>
- Organization: Syracuse University, Syracuse, NY
- Lines: 41
-
- In article <Bu34nA.3FB.2@cs.cmu.edu> ralf+@cs.cmu.edu (Ralf Brown) writes:
- ...I wrote...
- >} IDE (systems) could already be windows 32 bit disk access compatible.
-
- >They probably are, since they emulate the WD-1003 controller that the Windows
- >32-bit disk code was written for. I'm not sure I'd want to be the first
- >person to try it, though.
-
- Windows is pretty good about this. Select the box in the 386 enhanced menu
- amd unless you are able to 'save' the configuration (on exit), the 32 bit
- selection will 'disappear' next time it starts...
-
- > IDE won't max out for a while...if the drives themselves keep getting faster
-
- I don't see how the drive can get much faster. Good access time are already
- around 10 mS, and we are talking physics. Mechanical parts, moving...
-
- >The more immediate limit to IDE (and ESDI) is likely to be the size of the
- >drive. If (as I suspect), the WD-1003 only permits 16 heads, then the
- >limit on IDE is 504 MB (1024 cylinders * 16 heads * 63 sectors/track); even
- >if a full 64 heads are available, the limit is less than 2GB--a size which
- >is already readily available even if not yet cheap ($3000+) in SCSI
-
- The WD-1003 spec does max out at 16 heads, but that isn't something cast in
- stone. A new backwards compatable standard shoud be in the near future...
- The 1024 cylinder limit is a dos limit, ide and esdi controllers don't
- have that same problem because the actual drive geometry is hidden
- (same as scsi). This makes the standard max size up around
- 1024 cyl x 1024 heads x 1024 sectors
-
- Even then, the sisze of drives is limited to the growth in systems. A whole
- new approach will ne needed soon...
-
- al
-
-
-
- --
- Al. Michielsen, Crouse Hinds School of Management, Syracuse University
- InterNet: amichiel@mailbox.syr.edu amichiel@sunrise.acs.syr.edu
- Bitnet: AMICHIEL@SUNRISE
-