DSHD Disks in the TI DSSD Drives

[bholcomb007]

Ok, I just got everything going and got the Disk Manager 2 cart and I attempted to test the old TI Disk Drive in the PEB...and...the manager gave me an I/O Error 16. Wondering what was up, I noticed I had DSHD disks...I know you can format DSDD disks in the DSSD drive, but I am not sure about the DSHD disks? Is that possible and my drive is failing or is it the fact I am not using a DSDD or DSSD disks in the drive?

 

Would like to know if I just need to get some DSDD/DSSD disks to try out and see if it, in fact, is the drive and not a disk issue.

 

P.S. - the disks are brand new...just noticed now that I got the HD disks...my bad.

 

Thanks,

Ben

Edited May 29, 2015 by bholcomb007

[Shift838]

Does it give you a IO16 as soon as it starts or how far does it get?

[bholcomb007]

It seems to attempt the access and fails within a few seconds.

[bholcomb007]

I also tried the comprehensive test but, of course, it cannot initialize the disk so I get all sorts of address read errors after the tests initialize attempt.

Edited May 29, 2015 by bholcomb007

[Shift838]

IO 16 usually means no disk in drive or no drive.

 

are you sure you are inserting the disk correctly? if this is a standard 90k drive from TI the label of the disk would usually face right.

 

You can always try to flip the disk over and try it again.

 

I have never tried to format a HD 5.25 in a standard drive, but I would think it would work. I do format 1.44 mb as 720k. I just have to tape over the HD hole..

[+Schmitzi]

I am not sure but I think it does not work. I think you´ll need 40track-floppies with 48tpi

[mizapf]

Have a look at

 

http://en.wikipedia.org/wiki/List_of_floppy_disk_formats#Physical_composition

 

The important column in that table is "Coercivity". It is the ability of the magnetic cells to withstand magnetization. The higher the coercivity, the stronger the external magnetic field must be.

 

Accordingly, a DD floppy drive likely fails to magnetize the cells of a HD floppy disk.

[bholcomb007]

Cool...thanks for the info. I was thinking an SD drive would not work on HD disks...it was an oversight when I bought them.

 

I have a friend that is going to look for a SD or DD disk so I can try it out and see if it works.

 

Thanks for all the answers!

I love this forum!

 

Just got another TI after 30 years because it was the first computer I had and it got me into programming. I am trying to get this one set up so I can start programming on it again and do the things I could not back then. Very exciting times! Also the kids are loving it and that makes it even better to me.

 

Super thanks all,

Ben

[+Lee Stewart]

Michael is right. You absolutely cannot successfully write to an HD disk (1.2MiB) in any but an HD drive.

 

...lee

[+OLD CS1]

Thirded and fourthed: do not use HD media in non-HD drives. Period, end of story, irrespective of how many people say "it works fine for me."