Search found 337 matches

by SomeGuy
Thu Aug 05, 2021 7:07 pm
Forum: Dumping
Topic: How to combine 2 raw dumps from the same disk to patch errors?
Replies: 12
Views: 255

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

You ever listen to an analog TV or radio, trying to understand what someone is saying over a lot of "static"? That is what the kryoflux decoding does. The .raw files contain the signal as is, including all the noise and variance. No two raw dumps will be identical. The decoded IMG files ar...
by SomeGuy
Wed Aug 04, 2021 8:29 pm
Forum: Dumping
Topic: Should I keep my .raw files after I get a good image?
Replies: 5
Views: 241

Re: Should I keep my .raw files after I get a good image?

There are many, many different kinds of copy protections. Many of those protections went to great lengths to keep people from finding the protected bits. Warnings about different numbers of sectors, different sized sectors, or anything that deviates from standards, may be a hint as to copy protectio...
by SomeGuy
Tue Aug 03, 2021 11:18 pm
Forum: Dumping
Topic: How to combine 2 raw dumps from the same disk to patch errors?
Replies: 12
Views: 255

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

There are a variaty of reasons that one drive might read a disk better or worse than another drive. A 360k drive has a wider read/write track width so picking up good data at the "edges" that a 1.2mb would not touch can result in a better read. Conversely, sometimes the "edges" m...
by SomeGuy
Tue Aug 03, 2021 11:11 pm
Forum: Dumping
Topic: Should I keep my .raw files after I get a good image?
Replies: 5
Views: 241

Re: Should I keep my .raw files after I get a good image?

Preservation stream/.raw dumps can be used to help prove the "authenticity" of the data on the disk. For example, on MFM disks the kryoflux software can show if a sector was written to by a user after a disk was professionally mastered at a factory. If a disk was professionally mastered, t...
by SomeGuy
Sun Jul 18, 2021 12:08 am
Forum: Support
Topic: help writing bootable Osborne disks from stream files
Replies: 29
Views: 957

Re: help writing bootable Osborne disks from stream files

So in other words, it sounds like a drive speed issue. Check and adjust the A drive's RPM speed. Check for any damaged motor control components.
by SomeGuy
Fri Jul 16, 2021 3:40 am
Forum: Support
Topic: TEAC FD-55BR doing weird noise when calibrating with Kryoflux
Replies: 8
Views: 262

Re: TEAC FD-55BR doing weird noise when calibrating with Kryoflux

If you know what the maximum tracks should be set at, you don't need to do that.

If you suspect anything isn't plugged in right, the calibrate test is indeed an easy way to check. As you gain confidence in the hardware setup, you probably will eventually just skip that unless a problem arises.
by SomeGuy
Thu Jul 15, 2021 3:04 pm
Forum: Support
Topic: TEAC FD-55BR doing weird noise when calibrating with Kryoflux
Replies: 8
Views: 262

Re: TEAC FD-55BR doing weird noise when calibrating with Kryoflux

On a decently manufactured drive such as a Teac, no it shouldn't damage anything. Supposedly on some very, early or very cheaply manufactured drives there is a slight risk. But I have never run in to a drive that could be damaged like that. Keep in mind that on IBM PCs, any piece of software could e...
by SomeGuy
Thu Jul 15, 2021 5:14 am
Forum: Support
Topic: TEAC FD-55BR doing weird noise when calibrating with Kryoflux
Replies: 8
Views: 262

Re: TEAC FD-55BR doing weird noise when calibrating with Kryoflux

Right at the end of a calibrate, there may be a very momentary unhealthy sounding noise as the head tries to step behind the last possible track, hitting the stop. Also, some drives are noiser than others, so the noise will vary from drive to drive, even of the same model.
by SomeGuy
Wed Jul 14, 2021 9:19 pm
Forum: Support
Topic: help writing bootable Osborne disks from stream files
Replies: 29
Views: 957

Re: help writing bootable Osborne disks from stream files

First of all, what kind of drives are you using for this? You can't use an IBM PC style "1.2mb" (80 track 96tpi drive) to write a disks for use in a "360k/180k" 40 track 48tpi drive. (Technically, if you degauss the target disk first it should work, but that can be a headache) Se...
by SomeGuy
Tue Jul 06, 2021 2:24 am
Forum: Dumping
Topic: Is this a normal dump?
Replies: 14
Views: 400

Re: Is this a normal dump?

Try formatting a DSDD floppy disk as "quad density" using the good drive (80 track, 720k format). That will be close enough. Locate any 720k 3.5" floppy image .IMG file, drag it to HxC, export as Kryoflux format, and write that in your good drive, make sure not to enable double steppi...