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- Newsgroups: comp.os.os2.misc
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!uwm.edu!linac!uchinews!ellis!sip1
- From: sip1@ellis.uchicago.edu (Timothy F. Sipples)
- Subject: Re: A very unnerving message
- Message-ID: <1993Jan6.195729.20545@midway.uchicago.edu>
- Sender: news@uchinews.uchicago.edu (News System)
- Reply-To: sip1@midway.uchicago.edu
- Organization: Dept. of Econ., Univ. of Chicago
- References: <MSALETNI.93Jan6121034@jade.tufts.edu>
- Date: Wed, 6 Jan 1993 19:57:29 GMT
- Lines: 46
-
- In article <MSALETNI.93Jan6121034@jade.tufts.edu> msaletni@jade.tufts.edu (Michael J. Saletnik) writes:
- >As I was working yesterday, I had a few intense processes going. As a
- >result, when I opened a folder, my drive started going nuts.
- >Suddenly, I heard a sound that reminded me all too well of my last
- >hard drive when its heads slammed into the platters. Only louder and
- >much worse. I received the message:
- > A defective sector on drive D: has been replaced.
- > No data was lost.
- > You should run CHKDSK soon to restore full performance
- > and to replenish the spare sector area of the volume.
- >This was an HPFS disk.
- >Now, what *really* happened? Is this legit? Based on the sound from
- >the drive, I thought it was tracking off the end of the disk. I can't
- >imagine that kind of bang, grind, and click (yup, all three) from
- >merely failing to find a sector.
-
- It is legit.
-
- What you have discovered is a minor bit of fault tolerance found in
- HPFS under OS/2. It is called hot fix. During format HPFS sets aside
- a certain number of spare sectors (100 by default, I believe). If
- HPFS encounters a bad sector during operation it will borrow one of
- these spare sectors from its pool and "hot fix" the sector, mapping
- the spare in place of the defective sector. It all happens
- transparently, and your only notification is that warning dialog.
-
- If you didn't have this feature, you would now be going through a
- rather painful recovery procedure, quite possibly, trying to restore
- the file that was occupying that bad sector. Your system may have
- been rendered inoperable if the file was critical enough.
-
- Clever, isn't it?
-
- >When I booted from floppy and ran CHKDSK, it told me:
- > CHKDSK corrected a minor filesystem error
- >Great message, eh?
- >Any thoughts are welcome...
-
- It's amazing that OS/2 takes it so casually, but that's what HPFS buys
- you -- added security.
-
- --
- Timothy F. Sipples | Read the OS/2 FAQ List 2.0h, available from
- sip1@ellis.uchicago.edu | 128.123.35.151, anonymous ftp, in /pub/os2/all/info
- Dept. of Econ., Univ. | /faq, or from LISTSERV@BLEKUL11.BITNET (send "HELP")
- of Chicago, 60637 | [Read the List, THEN post to ONE OS/2 newsgroup.]
-