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- Path: sparky!uunet!gatech!destroyer!cs.ubc.ca!unixg.ubc.ca!ucla-mic!oculus.loni.ucla.edu!li
- From: li@oculus.loni.ucla.edu (James Li)
- Subject: 3rd Party Disks (FAQs #35 disktab & #44 HD utility)
- Message-ID: <1993Jan22.090345.16160@mic.ucla.edu>
- Nntp-Posting-Host: 149.142.138.33
- Organization: Jules Stein Eye Institute
- Date: 22 Jan 93 09:03:44 PST
- Lines: 82
-
- Re: FAQ #35
- Does anyone have any experience with drives that DO NOT have a constant
- number of Sectors per Track? We just bought a Quantum Pro1225 and the Sectors
- per Track is between 44 to 92. What should go in the disktab entry under
- 'ns' (sectors per track)?
-
- Re: FAQ #44
- I was told by Apple Tech Support that HD Setup will avoid having to deal
- with the disktab file. Why then (besides the password protection mentioned
- below) would one choose to use a different set-up? Is there an actual
- or a potential speed advantage?
-
- Thanks for any information and suggestions.
-
- James Li
- li@oculus.loni.ucla.edu
-
- [The rest of this message contains the FAQ entry for Questions 35 and 44]
-
- ===
- 35) How can I figure out the /etc/disktab entry for my hard disk?
-
- Many hard disk applications will reveal the disk drive geometry for you:
- FWB Hard Disk ToolKit and SCSI Evaluator are very good (SilverLining is a bit
- wrong on the number of tracks... it includes spares). What you are really
- looking for are the total number of cylinders ('nc'), the number of sectors
- per track ('ns') and the number of tracks ('nt'). Also, I'm maintaining
- a list of /etc/disktab entries. If you have any, send it to me and I'll
- add them.
-
- The file will be available via anon-ftp on jagubox.
- <<ED: I need _LOTS_ of entries>>
-
- Just a note: the number of tracks ('nt') is equal to the number of heads.
-
- ===
- 44) I heard the the Installer for 3.0 works on "any" 3rd party hard disk.
- Well, it doesn't on mine!
-
- Well, the Installer will work with any 3rd party disk but there are a few
- wrinkles... The HD Setup application in the 3.0 Installer is unique in that
- not only does it create A/UX partitions but it also creates the actual file
- systems in those partitions (basically it runs 'newfs'). Now if you have
- used some other HD utility program (such as SilverLining or FWB HDT) to
- create the partitions and then attempt to install A/UX on that disk, the
- Installer sees that the partitions are there and then _assumes_ that they
- were created by HD Setup and therefore have the file systems already created.
- Of course, the file systems don't exist yet, just the partitions, so the
- installation fails.
-
- You have a few options:
-
- a. Run the Installer on a newly formatted disk. This means that HD Setup
- will do all the partitioning (etc...) and the installation will
- proceed. Note that this means you will be "stuck" with the Apple drivers
- whenever you are in the _real_ MacOS Finder.
-
- b. If you want to use the drivers on your HD utility (for stuff like,
- maybe, password protection of partitions) then you have two (maybe
- three )additional options:
-
- i. Use 'a' above to install A/UX. Then use your HD utility program to
- "take over" the disk, disabling (or even removing) the Apple drivers
- and installing it's own. Note that if there isn't enough space to
- install it's drivers, most will attempt to "shrink" the MacOS
- partition to make room. Most can do this with no problem, but why
- take the risk... when you partition the disk, leave about 64K
- available as free space.
-
- ii. Use your HD utility to create the partitions. Then, before you
- run the Installer, run 'newfs' "by hand" to create the file systems
- so that the installation can proceed.
-
- iii. Use your HD utility to format (etc...) your disk and create
- _only_ the MacOS partition. Now run the Installer. In most cases
- HD Setup will work fine with the driver installed on the disk.
- You can now use it to create the A/UX partitions.
-
- <<ED: I _know_ this (iii) works with FWH HDT 1.1.x>>
-
- ===
-
-