Search found 40 matches

by Alex
Sat Nov 20, 2021 2:36 pm
Forum: Dumping
Topic: Need help recover 8 bad sectors on a 800KB HFS Mac floppy from the 90's
Replies: 6
Views: 235

Re: Need help recover 8 bad sectors on a 800KB HFS Mac floppy from the 90's

I'm not too fond of manipulating the head while the read is in progress... Can't this damage the floppy and/or the drive? I ordered 2 other 3.5" drives: a Toshiba and a Mitsubishi (two brands that I didn't have). Maybe I will be more lucky with those drives (I doubt it)? I'll keep you guys upda...
by Alex
Fri Nov 12, 2021 8:22 pm
Forum: Dumping
Topic: Need help recover 8 bad sectors on a 800KB HFS Mac floppy from the 90's
Replies: 6
Views: 235

Re: Need help recover 8 bad sectors on a 800KB HFS Mac floppy from the 90's

These are the drives brand/model I used (I have multiples of some model): Brand Model Tracks Date Condition Alps DF354H090F 84 Feb 2005 Used NEC FD1231H 82 Oct 2005 New Panasonic JU-257A827P 84 Used Samsung SFD-321B 84 Used Sony MPF520-D 82 1996 Used <--- Sets the density based on the Density Line L...
by Alex
Thu Nov 11, 2021 9:36 pm
Forum: Dumping
Topic: Need help recover 8 bad sectors on a 800KB HFS Mac floppy from the 90's
Replies: 6
Views: 235

Need help recover 8 bad sectors on a 800KB HFS Mac floppy from the 90's

Hello everyone, I'm fiddling with my last Macintosh Plus 800k floppy from High School. It's full of bad sectors and trying to do a good dump with 10 different 3.5" drives. I managed to get a good read of most of the bad sector on a drive or another but for the remaining 8 bad sectors nothing wo...
by Alex
Wed Sep 22, 2021 1:31 pm
Forum: Dumping
Topic: Can you help me with this floppy?
Replies: 6
Views: 241

Re: Can you help me with this floppy?

Ahh got it now and can access the data! Sorry if I was slow to understand :P Your help is invaluable! Thank you soo much!
by Alex
Wed Sep 22, 2021 3:08 am
Forum: Dumping
Topic: Can you help me with this floppy?
Replies: 6
Views: 241

Re: Can you help me with this floppy?

So I copied from offset 1600 (x640) for a length of 200 (xC8) and pasted at offset 0 through 200 (xC8) basically overwriting the first 200 bytes and still unable to read the resulting patched .IMA. Did I understood wrongly? Thanks!
by Alex
Tue Sep 21, 2021 6:55 pm
Forum: Dumping
Topic: Can you help me with this floppy?
Replies: 6
Views: 241

Re: Can you help me with this floppy?

@brightcaster How can I do that? How did you find out?
by Alex
Mon Sep 20, 2021 1:25 pm
Forum: Dumping
Topic: Can you help me with this floppy?
Replies: 6
Views: 241

Can you help me with this floppy?

I have a 360K MFM (I believe) 5.25" floppy that I'm unable to read it's content. It's from the family hoard of the 80's (It's a blank disk that was used to save files) and I don't know what's on it. When I create an IMA from the RAWs my anti-virus find an early virus . Maybe it's the reason I'm...
by Alex
Thu Aug 05, 2021 7:56 pm
Forum: Dumping
Topic: How to combine 2 raw dumps from the same disk to patch errors?
Replies: 12
Views: 370

Re: How to combine 2 raw dumps from the same disk to patch errors?

Thanks everyone for all that information! I'm still fairly new to all this and find this "retro" tech fascinating. I saw white mold on at least 2 disks but I cleaned them all before using them. I just inspected that floppy. I see nothing noticeable on track 1 (looking through the "win...
by Alex
Thu Aug 05, 2021 5:38 pm
Forum: Dumping
Topic: How to combine 2 raw dumps from the same disk to patch errors?
Replies: 12
Views: 370

Re: How to combine 2 raw dumps from the same disk to patch errors?

Oh yeah, when both dumps converted to IMG everything is fine (the bad read is maybe used in a unused sector?). I was wondering when I compare RAW files for good sectors almost everything is different (for the corresponding sector in both dumps).
by Alex
Thu Aug 05, 2021 1:46 pm
Forum: Dumping
Topic: How to combine 2 raw dumps from the same disk to patch errors?
Replies: 12
Views: 370

Re: How to combine 2 raw dumps from the same disk to patch errors?

Here is an example. The same disk imaged on a Teac FD-55GFR (1.2 MB drive) and on a Teac FD-55BR (360 K drive). On the GFR dump the track 72.1 is "bad" while on the BR everything is OK. This would correspond to the 36.1 track on the BR dump, but what I don't understand is that all other (g...