Disk imaging with IMD - question

rich.cini at verizon.net rich.cini at verizon.net
Wed Aug 9 12:57:07 CDT 2017


See below. Hopefully inline works. I'm not shouting, just using caps. 

Rich

Sent from Verizon/AOL Mobile Mail

On Wednesday, August 9, 2017, Chuck Guzis via cctalk <cctalk at classiccmp.org> wrote:

On 08/09/2017 09:52 AM, Richard Cini via cctalk wrote:
> It's funny -- I didn't see the original reply from Bill to this
> message.
> 
> I am aware of the track differences and I thought Dos would format
> it but just slam the head for the last three tracks. No such luck. It
> actually complains about the disk from the beginning.
> 
> The Qume 242 is a DSDD drive in case that was asked in the original
> thread, and should work in this situation.


I'll try again--it doesn't matter if the Qume 242 (I've got one) is a
DSDD drive if you're using SS media. Peek inside the drive and you'll
see that there are *two* index sensors--one for single-sided and the
other for double-sided media. Unless you've got a hole punch handy, you
can't format single-sided media to use both sides.

YES I KNOW. I HAVE BOTH KINDS OF MEDIA. RIGHT NOW USING 3M DSDD MEDIA. 

Okay, a DOS format is more than a simple IMD-type format, which does
little more than instruct the FDC to write a bunch of E5-filled sectors
and headers.

OK, DIDNT KNOW THAT. 

A DOS format also writes a boot sector, FAT and root directory. If most
late versions of DOS don't see a valid boot sector, you'll get a
"General Failure" error. If you use IMD to format the disk, use the
"Analyze" option to verify what you've got.

UNDERSTAND WHAT DOS WRITES. I WILL SEE WHAT ACTUALLY GETS WRITTEN. USING ANALYZE. 

INTERESTINGLY IMD CLAIMS NOT TO BE ABLE TO READ ONE OF THE DISKS THATS TO BE IMAGED -- AN 8" MDSOS 2.0 DISK FROM A GAZELLE. I WOULD CONSIDER THE DISKS IN AN UNKNOWN CONDITION. CHICKEN AND EGG. THESE ARE ORIGINAL SCP DISKS SO I DONT WANT TO EXPERIMENT MUCH ON THEM. 

I hope I've been clear--lately, I tend to assume too much.

"DON'T ASSUME..." AS THEY SAY ON TV. I'M OK WITH THE ADDITIONAL CLARITY. SINCE YOU HAVE A WORKING 242, WOULD YOU MIND CONFIRMING THE JUMPER SETTINGS FOR ME? JUST TRYING TO ELIMINATE AS MANY POTENTIAL ERROR POINTS. 

Thanks all. 

--Chuck



More information about the cctalk mailing list