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- Path: sparky!uunet!usc!zaphod.mps.ohio-state.edu!rphroy!caen!uflorida!winnie!yacht!edwards
- From: edwards@ee.fit.edu (John Edwards)
- Newsgroups: comp.periphs.scsi
- Subject: keywords:RODIME,root dir,glitch,ARGH,help?,hacks?
- Summary: discussion of options to fix a glitched rodime SCSI drive
- Keywords: rodime,in2000,msdos,root,recover
- Message-ID: <edwards.725770053@yacht>
- Date: 31 Dec 92 02:47:33 GMT
- Sender: usenet@winnie.fit.edu
- Organization: Florida Tech, CP/EE Dept.
- Lines: 68
-
-
- Posted for a friend, email replies to luckey@rtfm.mlb.fl.us
-
- Well, I have seen other hard drives do odd things when sitting idle.
- seagates burble (updating system info data on usage?) Minscribes
- whose LEDs turn read when heads park on idle timeout. So, how was I
- to know that that "clickBurble" my new Rodime 8259T (yes, another
- Hi-tech customer) wasn't doing what it was supposed to. Turns out
- what it WAS doing was deciding that I'd turned off powerand suddenly
- changed my mind: its power off circuit thought it was time to park
- heads.
-
- Well, it was wrong. And one time it screwed up the 2nd sector of
- my DOS root directory. But more on that later. After researching
- what a rodime was supposed to do, I decided that my AT's power
- supply had more ripple than the rodime wanted. So I made up a
- special power cable with 2200 mfd caps on both 12V and 5V lines.
- This seems to work. no more clickBurbles.
-
- so now I have a drive with a screwed up directory, what to do
- : try Norton Disk Doctor. NDD says no luck, use Norton Calibrate
- to reformat sector. Calibrate says no way. Oh well, It knows no
- kind of reformat track for a SCSI drive. Suggested solution: reformat
- everything.
-
- Well, I'm not quite ready to do that. While I have my important stuff
- backed up, there is alot of collected non critical data I'd prefer not
- to lose if I can avoid it. If I could get that 2nd sector to be
- writable again, I feel NDD could repair the volume. But how to do
- that when a SCSI FORMAT UNIT command is an all or none type of thing.
-
- Well, these are the only things I can think of being able to do
-
- 1) back up a sector by sector image of the drive, reformat, then do
- a sector by sector restore.
-
- 2) intercept the proper intercept and make reads and writes to that
- sector, and that sector only, work from a RAM copy. Then correct
- with NDD, then do a file by file backup
-
- 3) find out if a Rodime 3259T supports a RELOCATE SECTOR scsi command,
- and if it does, somehow issue it one.
-
- None of these seems to be an off the shelf solution. I don't have
- any software that can do a sector by sector backup. I don't have
- a device driver that can ghost to RAM a bad sector. I don't have
- a 3259T manual, nor a IN2000 utility to issue random scsi commands.
-
- So I have 100 Megs of data in the first half of a 200 meg hard drive
- with nowhere to put it.
-
- What I do have is. an 85 meg ST296 on its way here, a copy of an
- ASPI driver for an IN2000 scsi adaptor, and access to source example
- via FTP or GEnie. So how can I put it together?
-
- Best I can think of is writing a sector by sector backup program from
- scratch, calling INT 025 to get raw sectors, then saving it on a
- STACKER compressed ST296. But I'm leary of debugging a new program
- on data that I don't want to lose
-
- Does anyone have any better ideas?
-
- Does anyone know an already implimented version of one of the hacks
- I've thought up?
-
- Does anyone know how to do a relocate sector on a RODIME drive?
-
- December has been a bad month for diskdrives for me.
-