View Full Version : IBM PC XT 5160 -- C drive problem

May 10th, 2014, 01:27 AM
Please see attached photos. Either the information I'm entering is wrong (cylinders, heads, sectors, precomp, etc.) or the drive is damaged. I'm also looking for a copy of PC DOS 2.0 on a 5.25" floppy disk.

May 10th, 2014, 04:22 PM
Welcome to these forums.

You have an RLL controller and an RLL drive (the "R" in ST-125R).

The 17 you've entered for 'sectors per track' is typical for MFM drives. RLL drives have more. One reference to the ST-125R that I see indicates 26 sectors per track.

But I can't see why you entering a lesser amount would cause the "Failed to format the reserved track" error message that you see.

Did that error message occur at the start of the initialisation, or part way through?
If at the start, how confident are you that you have the cables connected correctly?

May 10th, 2014, 05:11 PM
You have an RLL controller...How did you determine this?

May 10th, 2014, 05:14 PM
Error msg comes at the end. Cables are connected correctly. It was working when I boxed it up 20 years ago! Booted it up for the first time last month.

May 10th, 2014, 05:18 PM
How did you determine this?
Doh! I saw "ST11" and "ST-125R" and my old brain magically transformed the "ST11" to "ST11R" in order to match the ST-125R, without me even thinking about it.
Next time, I am going to make sure that I have at least two morning coffees before answering questions.

May 10th, 2014, 05:36 PM
Error msg comes at the end. Cables are connected correctly. It was working when I boxed it up 20 years ago! Booted it up for the first time last month.Based on those four assertions, I vote for hosed drive.

May 10th, 2014, 05:47 PM
Sounds right. Does anyone know where I can buy a replacement drive?

May 10th, 2014, 06:00 PM
You could try SpeedStor on it. You never know, you might get lucky.

What kind of drive are you looking to replace it with?

May 10th, 2014, 06:30 PM
Preferably 20 MB from the mid 80s for less than $200, tested and working.

May 10th, 2014, 07:26 PM
I have an ST-238R (I know, that's not 20 MB. but it would be with an MFM controller.) I also have a WD1002-27X RLL controller for it. And I have an ST-225. Both work fine.

May 10th, 2014, 08:50 PM
Stupid question. Why not an XT-CF controller? Faster, more reliable, quiet and cheaper than $200 for a drive and controller--and you can swap CF cards right through the back bracket. No screwdriver necessary.

Just saying. Maybe we should make a box with a speaker to imitate the sound of a hard disk? :)

May 12th, 2014, 04:38 AM
Of course. I'm just trying to restore the computer to the state I remember for nostalgia's sake.

May 16th, 2014, 05:43 AM
I bought a hard drive from Stone, and it works great. Thanks, Stone!

May 16th, 2014, 07:43 AM
You're quite welcome, Ayman. IIRC, that drive had no bad sectors on it.

Glad I could be of assistance in helping you set it up.