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From: schuh@geowhiz.UUCP
Newsgroups: net.micro.mac
Subject: macintosh file system and disk layout questions.
Message-ID: <429@geowhiz.UUCP>
Date: Mon, 28-Apr-86 10:23:59 EDT
Article-I.D.: geowhiz.429
Posted: Mon Apr 28 10:23:59 1986
Date-Received: Fri, 2-May-86 07:47:33 EDT
Distribution: net
Organization: UW Madison, Geology Dept.
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	I just spent (too much) time trying with the help of FEdit
to fix up a disk.  The FEdit documentation, which until this
time I had not bothered to download proved to be a wealth of
information.  Good reading.  However when trying to muck about
I ran accross some "bad" sectors.  When FEdit (Resedit wont read 
it either) tried to read them it said something about file errors 
and told me it couldt find the requested sector on the track. ???? 
Wow, I thought what gives.
The file in question was the Clipboard file should be free of any 
nasty protection schemes thought I,  well following the documentation I 
looked in the directory sectors and traced all the blocks in the volume
table etc... everything looked fine.  My question then is who tells
what where these things are,  where are the bytes that tell whoever needs
to know a sector is trashed, does that mean its trashed physically 
ie the hardware cant read it?  Can it be fixed.  
What could possably be on a disk that could not be read by the head, 
even if it is garbage?  How can a disk drive just go and loose a 
sector like that, fine father it is.

Thanks in advance for any help
dave schuh
!uwvax!geokwhiz!schuh


PS by way of confession I had done some mucking with the directory blocks
before I discovered the unreadable sectors, but I changed things back.
I dont know for sure whether they were there before or not.