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WD 1002S-WX2 issue

R

Retro Canada

Experienced Member
Joined
Aug 23, 2012
Messages
280
Location
Vancouver, BC
My original WD-1002S-WX2 that came with my 5150 died. It stopped working, SpeedStor could not even find a controller. Then I get a replacement from ebay (another WD-1002S-WX2)... but this one only works in 10MB mode.

I have set the jumpers 1 and 3 closed for the 20MB (my drive is a ST-225) but past the cylinder 304 the drive cannot read, write or seek. The drive make a long seek and always fails. If I remove the jumpers and set to 10MB it works fine.

I even switched the PLCC from the new one to the old card and the same results (it was this chip that went bad). Setting the jumpers make it visible to SSTOR that the drive is a 605 cylinders, but it doesn't work past the 304 one.

What could it be ? Another bad WD-1002S-WX2 ? The ST-225 was working as 20MB before. I don't think it partially broke together the controller... I also have a HH-612C but this is a 10MB one.
 
Well dont assume its not the ST-225. A 35 year old hard drive will fail. I probably had 3 or 4 ST-225's already completely die on me.

I would test additional drives on the controller and determine if its the controller or the drive.
 
I wonder if another WD1002 WD BIOS might yield different results. The one I have asks for drive parameters, rather than relying on jumpers. I can post it if you can burn a 2732 or 2764 EPROM.
 
I had a similar issue with a Panasonic Sr Partner, which arrived with no hard drive but did have a WD controller (I forget the exact number, but similar to yours). I fitted an ST-225. SSTOR could see the full 21MB but any seek attempts past cylinder 304 with any DOS version would fail. I just assumed the BIOS table was limited to 10MB (the BIOS was ancient and had no inbuilt formatting tool). SSTOR was clever enough to see the actual drive, but the BIOS couldn't. 10MB was enough for my needs so I didn't worry about it. As Chuck(G) says, a different BIOS would probably allow full access.
 
VERAULT said:
Well dont assume its not the ST-225. A 35 year old hard drive will fail. I probably had 3 or 4 ST-225's already completely die on me.

I would test additional drives on the controller and determine if its the controller or the drive.
Click to expand...

I know, but isn't it strange that exactly the cylinder 305 that starts the problem ? The very first track out of the 10MB range...
 
My first WD card was accessing 20BM with no problem. The second cannot.

But then I swapped the PLCC chip and yet on the first card same problem persisted. I didn't change the first card bios.

It's either the drive or the new PLCC chip.
 
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