martin@sunc6.cs.uiuc.edu (RoCCo mArtIn) (04/16/91)
Hi, hope you can help!
I just installed a Quantum 105S (lucky me!) on my 2000HD, but don't
know what to do about the Inner Zone. I have two partitions (and the
RES2: device) on the outer zone which has 35 sectors/track. I also have a
partition that takes up all of the inner zone, which has 28 sectors/track.
The problem is that AmigaDos won't let me format this partition, presumably
because the corresponding RES drive is listed at 35 sectors/track.
Please don't tell me that I can't use the last 20Meg of my hard disk!!!
What can I do to get AmigaDos to accept this black sheep as one of the
family?
Thanks,
- Rocco
P.S. If it matters, I have a 2090a controller, and have the Quantum set to
be SCSI device 0.
--
Name: Rocco Martin |
Internet: martin@cs.uiuc.edu, or roccom@tahoe.unr.edu --+--
Witty saying: You can pick your nose, you can pick your friends, |
but you can't wipe off your friends behind the couch... |markv@kuhub.cc.ukans.edu (04/17/91)
In article <280A74F5.599C@ibma0.cs.uiuc.edu>, martin@sunc6.cs.uiuc.edu (RoCCo mArtIn) writes: > Hi, hope you can help! > > I just installed a Quantum 105S (lucky me!) on my 2000HD, but don't > know what to do about the Inner Zone. I have two partitions (and the > RES2: device) on the outer zone which has 35 sectors/track. I also have a > partition that takes up all of the inner zone, which has 28 sectors/track. > The problem is that AmigaDos won't let me format this partition, presumably > because the corresponding RES drive is listed at 35 sectors/track. > Please don't tell me that I can't use the last 20Meg of my hard disk!!! > What can I do to get AmigaDos to accept this black sheep as one of the > family? *Ignore* the zones and the physical architechure of the disk. AmigaDOS doesn't really pay any attention to the BlocksPerTrack etc. All AmigaDOS does is say if disk A has 100 tracks, 3 surfaces, and 10 blocks per track than the disk has 100*3*10 or 3000 blocks. Whenever AmigaDOS accesses a disk, it simply requests a logical block(s) from the drive. Sooo. Just pick some numbers that multiply out to be close to the total capacity of the drive (but never go over of course). For the RES0 parition, just make sure that there is enough space to hold the RDB structures and FileSystem code, 50K is usually plenty, esp. since 2.0 wont need FFS on disk. The typical default gives about 64K which is more than enough. So, if you dont' want to re-format/prep the drive, just address the remaining cylinders of the drive as if they were 35 blocks per track and scale down the number of tracks. For an examples, 20 MB at 28 sectors per tract with 3 surfaces is about 240 cyls. For this example, 240 cyls * 3 surfs * 28 bpt = 20,160 blocks. 20,160 blocks / 3 surfs / 35 bpt = 192 cyls, so say the rest of the disk is 192 cyls. (Obviously substitue the correct #s, and round down on the cyls). > Thanks, > - Rocco > > P.S. If it matters, I have a 2090a controller, and have the Quantum set to > be SCSI device 0. No this doesn't matter. This may sound kludgy, but is the only way with most devices, and works fine. SCSI devices can be adressed physically or logically, but the Amiga always just uses a logical block #. Now a question of mine, do the Quantum ProDrives come up with the Cache on by default, or does the driver have to send a mode command to turn it on, and...if the driver does have to enable it, then which drivers do this? From the results I've gotten with DiskPerf and my Supra WordSync the cache seems to be on. > -- > Name: Rocco Martin | > Internet: martin@cs.uiuc.edu, or roccom@tahoe.unr.edu --+-- > Witty saying: You can pick your nose, you can pick your friends, | > but you can't wipe off your friends behind the couch... | -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Gooderum Only... \ Good Cheer !!! Academic Computing Services /// \___________________________ University of Kansas /// /| __ _ Bix: mgooderum \\\ /// /__| |\/| | | _ /_\ makes it Bitnet: MARKV@UKANVAX \/\/ / | | | | |__| / \ possible... Internet: markv@kuhub.cc.ukans.edu ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
jesup@cbmvax.commodore.com (Randell Jesup) (04/27/91)
In article <1991Apr16.162914.29758@kuhub.cc.ukans.edu> markv@kuhub.cc.ukans.edu writes: >No this doesn't matter. This may sound kludgy, but is the only way >with most devices, and works fine. SCSI devices can be adressed >physically or logically, but the Amiga always just uses a logical >block #. Actually, you can only address SCSI drives by logical block number. >Now a question of mine, do the Quantum ProDrives come up with the >Cache on by default, or does the driver have to send a mode command to >turn it on, and...if the driver does have to enable it, then which >drivers do this? From the results I've gotten with DiskPerf and my >Supra WordSync the cache seems to be on. Quantums come from the factory with caching enabled. It is possible to turn it off and save this setting if you don't want caching. -- Randell Jesup, Keeper of AmigaDos, Commodore Engineering. {uunet|rutgers}!cbmvax!jesup, jesup@cbmvax.commodore.com BIX: rjesup Disclaimer: Nothing I say is anything other than my personal opinion. Thus spake the Master Ninjei: "To program a million-line operating system is easy, to change a man's temperament is more difficult." (From "The Zen of Programming") ;-)