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Conference 7.286::atarist

Title:Atari ST, TT, & Falcon
Notice:Please read note 1.0 and its replies before posting!
Moderator:FUNYET::ANDERSON
Created:Mon Apr 04 1988
Last Modified:Tue May 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:1433
Total number of notes:10312

762.0. "Help required for corrupt floppy...!" by IGETIT::MCDONNELLJ () Mon Feb 05 1990 09:29

I'm hoping that somebody can help me - the tale of woe is as follows;

Many moons ago, I completed Dungeon Master with a set of mega-powerful heroes 
... on Saturday I brought Chaos Strikes Back ... went to copy the disk - sure 
enough there is the DMGAME.DAT file ... started copying ... no error message - 
looked on the target diskette - no file there... looked on the source diskette 
... aargh! I got a '0 bytes stored in 0 items' message.

I've tried the disk in another drive so I'm sure (reasonably sure!) that the 
problem is in the FAT.

I don't want to pay out a fortune for a commercial disk doctor (I'm a confirmed games-only 
fan - sneer if you like) so what I need is either;

1. Someone who can recommend a good PD disk editor/doctor.

2. Some kind soul who would actually be prepared to do it for me! (Lazy? me?)

Seriously - any help would be appreciated...

John.
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762.1Suggestion on how to fix it.SICKO::PATTERSONMon Feb 05 1990 12:4325
If you want to give it a shot yourself, this is the first thing I would try: 

	Start by reading the boot sector to see if it says where the 
		Directory sectors are.
	If not, try the standard location.
	If not there either, look on a different DM game disk.
	If still no luck, search the disk for one of the files know to be
		on the disk originally.

	If you can find the directory sectors the first part maybe messed up, 
		but the rest may be good and point to the file.

	You could even try to find the file on a different DM disk and look 
		in that location.

	Still no luck, read the file from a good disk, and search for something
		that will identify your file.

I know there are PD programs to do what you want, but I don't happen to know
where any are on the net, but I'm sure you might find one if you look in topic
#9.  I have seen files get completely destroyed by things like this, so the
first thing you should do is copy the whole disk, and work from the copy. 


Jim Patterson
762.2Read 755.*OLDTMR::WALLACEMon Feb 05 1990 12:447
> 1. Someone who can recommend a good PD disk editor/doctor.
A discussion about this is currently goin on in note 755.*

FWI: Sounds more like a corrupt directory than fats, since it can't find any
files.

	Ray
762.3ST Disk Storage Architecture?KERNEL::BARTLEYMon Feb 05 1990 17:437
    Can someone write a few words of introduction about ST Disk Storage
    Architecture please.  Or, if it needs too many words, can you recommend
    a good, but not-too-expensive book.
    
    Thanks,
    
    Theo
762.4STWORLD has a good exampleUKCSSE::KEANETue Feb 06 1990 06:439
    
    Theo,
    
    There is an excellent article in the DEC ST WORLD, (also a review of
    the knife)
    
    I am sure you could borrow a copy in Viables, if not mail me and I will
    bring in my copy.
    
762.5It's the samePRNSYS::LOMICKAJJeffrey A. LomickaTue Feb 06 1990 09:391
I used MicroSoft's book on MSDOS internals, availale at most bookstores.
762.6-< The same as MS-DOS? >-IGETIT::QUALITYTQM is a source of profit,not costWed Feb 07 1990 11:026
    Theo, I <think> that the ST's disk format is the same as MS-DOS. If it
    is, I can dig some information out for you. Can someone confirm this?
    
    I'd just like to say "thanks Jim" - you've been a big help so far -
    I've gotten hold of a disk editor an' I'm going to have a hack and slay
    tonight. I'll let you know how I get on.
762.7Do you need a copy of the disk?SICKO::PATTERSONWed Feb 07 1990 13:4316
	If you need a copy of the disk, I could use a sector copier
	to get the format and data from my copy and squeeze it into
	one file, then UU encode it and send it to you.  You could
	then at least you could look at the positions of the files.
	You couldn't run the program since the copy protection won't
	get passed through the squeeze program.

	One thing to check if you compare your disk with a different
	copy is, make sure the version is the same.  I would guess
	they make a master disk and then just copy the whole disk
	structure and all.  But a different version would come from
	a different master disk.  A possible test for this would be
	looking at the serial number(or ID, or whatever they call it)
	on both disks.

	Jim Patterson.
762.8< I said I'd do it and I did it >IGETIT::MCDONNELLJThu Feb 08 1990 07:1214
Just thought that I'd let you all know that the operation was a success - I 
used a combination of RECOVER (to search for the file) and ENGINEER ( to 
recreate the directory - I used a KGD as a template for that), it seems to have 
done the trick!

I've now regained my super-heroes and can now go beat the living s**t out of 
the monsters in CHAOS STRIKES BACK... but I guess that's stuff for another 
topic. 

Thanks again for all the advice,

Regards,

John.