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Conference hydra::amiga_v1

Title:AMIGA NOTES
Notice:Join us in the *NEW* conference - HYDRA::AMIGA_V2
Moderator:HYDRA::MOORE
Created:Sat Apr 26 1986
Last Modified:Wed Feb 05 1992
Last Successful Update:Fri Jun 06 1997
Number of topics:5378
Total number of notes:38326

1159.0. "Diskdoctor?" by UTRTSC::VIS () Fri Feb 12 1988 09:11

    Hi there, 
    	can anyone tell me if "DISKDOCTOR" is bugged or not.
    	Once I had a corrupted disk, diskdoctor thru a lot of files
    	away (with verify). Some of those file were readable with
    	type or edit or whatever.
    	It suggested to save the noncorrupted files and reformat the
    	disk, so I did.
    
    	Later on I tried DISKDOCTOR on a disk on which I've never had
    	any trouble. According to the DISKDOCTOR that disk was corrupt
    	too. 
    	Can anyone give me more information on this command?
    	Like what messages does it give, and when.
    
    	Thanks alot
    	Eric.
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1159.1DiskSalv FirstGLORY::SHIVESFri Feb 12 1988 13:079
    
    DISKDOCTOR's reputation is not very good actually.  I think I even
    read a note from someone in CBM that one should use DISKDOCTOR as
    a last resort.  I have had to use DiskSalv on two occasions and
    I think it works quite well. (DiskSalv can be found on Fish Disk
    20.) I think there is another disk salvage program, but I can't
    think its name.
    
    Mark
1159.2Sectorama?MDKCSW::DAVISThat's not a BUG, it's a FEATURE!Sat Feb 13 1988 20:115
The 'other' disk repair utility you may be thinking of is Sectorama (also
on a fish disk).  I've used DiskSalv with good luck a couple of times, but
I've never tried Sectorama.

						...richard
1159.3Normal "error" messagesTLE::RMEYERSRandy MeyersSat Feb 13 1988 21:4620
Re: .0

>    	Later on I tried DISKDOCTOR on a disk on which I've never had
>    	any trouble. According to the DISKDOCTOR that disk was corrupt
>    	too. 

How did DISKDOCTOR indicate that the disk was corrupt?  I think it is
normal for DISKDOCTOR and DISKSALV to issue all sort of "informational"
messages about finding duplicate keys, etc.  It is reporting inconsistencies
in the storage of deleted files and parts of deleted files on the disk.
These programs issue the message because they assume that the directory
structure is bad, and derive what the directory structure is from
redundant information stored in the headers of each block.  If they find
the remains of a deleted file, they assume that the file is intact and
valid until they come across an inconsistency in the file structure.
When such an inconsistency shows up, the program issues a message.

That is why whenever you run DISKDOCTOR (or DISKSALV) you get a ton
of messages issued.  It is also why any deleted (but intact) files on
the disk are undeleted by running these programs.
1159.4Diskdoctor messagesUTRTSC::VISMon Feb 15 1988 07:4927
Re: .3

> 								If they find
>	the remains of a deleted file, they assume that the file is intact and
> 	valid until they come across an inconsistency in the file structure.
>	When such an inconsistency shows up, the program issues a message.

So the inconsistency's should always come from deleted files, if my disk
is intact.
The messages are somthing like:

Replacing file <fl_nm1>
Replacing file <fl_nm2>
Replacing file <fl_nm3>
Replacing file <fl_nm4>
Replacing file <fl_nm5>
Replacing file <fl_nm6>
Replacing file <fl_nm7>
Replacing file <fl_nm8>
Copy theses files to another disk and reformat this disk!

These "Replacing files" should probably be the files that are consistant.
How about the last message. Did the DISKDOCTOR mess up the diskstructure??
or does it want you to get rid of your already deleted files?

Thanks for your replies so far,
Eric.	
1159.5Just a good ideaTLE::RMEYERSRandy MeyersMon Feb 15 1988 10:218
Re: .4

The reason that diskdoctor requests that you copy the files to a new
disk is that it assumes that the disk is corrupt since you had to run
diskdoctor on it.

If the disk itself was physically going bad, getting all the files you
want off of it and onto another disk is a very good idea.