Computer not accepting 1.44 mb formatted discs

February 13, 2019 at 19:16:17
Specs: MS-DOS
Hi, I’ve been trying to get into ms dos gaming, and I bought a usb 3.5 inch floppy disc drive to set up MS-DOS on a cheap industrial computer (relatively modern) I dont’t use. Every time I try to load the directory of the disc, all the file names are made up of strange random characters. This only happens if the disc is formatted to hold 1.44 megabytes. I’ve tried managing 1.44 mb sized discs with the usb drive on other computers, and it works perfectly. I only experience problems when I try to actually load and use files.

Btw using dos 5.0

message edited by Guacamoletortise


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#1
February 14, 2019 at 10:18:01
Hi Guacamole,

for such queries it can help much if the Make and *FULL* Model Number of the device concerned are provided.

Are you trying to run dos as a free standing os or under Windows, if so, what version?

Am wondering if the PC has USB1 and is not accepting USB2 problem.

Also you state:
"This only happens if the disc is formatted to hold 1.44 megabytes. I’ve tried managing 1.44 mb sized discs with the usb drive on other computers, and it works perfectly.

Am wondering if the pc concerned cannot handle floppies and thinks they are a device with a different format.

DOS 6.22 would be better.

Good Luck - Keep us posted.

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#2
February 14, 2019 at 19:12:28
Thanks for responding!

I’ve been using a Pre-assembled SuperLogics SL-1U-H61S-GC, Serial # 117800182
CPU: Intel Corp i3-3220 CPU @ 3.30 GHz
Model Name: Foxconn H16S

Demonstration: youtu.be/laOjtj7pLZc

I will try installing & using version 6.22, I will keep posted.


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#3
February 15, 2019 at 10:16:12
Hi Guacamole,

ah Commander Keen, that is a Blast from the Past!

Moving to dos 6.22 is good, but doubt it will cure your problem.

I cannot be sure from the Youtube Video as you move too fast, but the failing disk appears to have only one square Hole.

If so, the disk is not 1.44mb High Density, but 720kb Double Density, and could be the cause of your problem.

Would think you are using a driver, which not be able to handle that format size..

As a matter of interest where are you located?(City/State).
I am in West London.

Good Luck - Keep us posted.

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#4
February 15, 2019 at 12:22:16
"I bought a usb 3.5 inch floppy disc drive to set up MS-DOS on a cheap industrial computer"

First, how did you get DOS on a (relatively) newer machine:

https://www.superlogics.com/sl-1u-h...

MS-DOS (any version) doesn't natively have anything to communicate to USB, so what are you using to get it to identify or communicate with the USB floppy drive?

" I’ve tried managing 1.44 mb sized discs with the usb drive on other computers, and it works perfectly."

What operating system(s) were those other machines running?

"Channeling the spirit of jboy..."

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#5
February 18, 2019 at 12:50:36
Hey, sorry for not responding for awhile.

It is clear that I wasn’t very specific in my initial post and I apologize.

I purchased a
usb floppy drive from amazon expecting issues.

I had an authentic version of IBM DOS 5.0. I started by setting the computer to boot from the usb drive with the first of the three disks inside the drive and the install screen showed up. I continued to install it without any difficulties.

After it was installed I could acces the usb drive just by referencing the a drive. (I literally just typed in a: and I could read the disk.) I installed Commander Keen onto a disk (with the same drive that I used with DOS), and was able to run it with no issues, as was shown in the video.

Speaking of the video, both disks Are high density.

This only happens when I use disks that have been formatted to hold 1.44 mb (High density disks formatted to hold 720k work fine). I have another computer with a built in disk drive (windows 2000) that I can format disks with, and I discovered that if the disks are formatted to hold 1.44 mb, but have no files, the directory will show perfectly fine.

I also used the floppy drive with a windows 7 pc, and it handles all disk sizes well.


And I live in Minnesota (US).

Thanks.

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#6
February 18, 2019 at 15:22:58
Hi Guacamole,

it is my understanding that 3.5" DD disks have one square hole, while HD disks have two.

These square holes are used by detectors in floppy drives to determine the floppy disk type. If this is 100% true, would not expect some of your #5 Post statements to work.

However if one has an old DD drive, it does not look for the 2nd Square hole and treats HD disks as DD. Problems reading then occur when those disks are loaded in a later drive that finds the 2nd square hole and attempts to read as HD.

Could this be a factor here?

You advise HD formatted to DD work fine. How was this achieved?
To format such, the 2nd square hole needs blanking off with *BLACK* insulting tape, as the detection method can be either mechanical or optical depending on the drive used.

Good Luck - Keep us posted.


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