Tandon TM 502

Chuck Guzis cclist at sydex.com
Tue Jul 3 11:44:33 CDT 2007

On 3 Jul 2007 at 11:00, Ade wrote:

> I recently picked up an old Act Sirius 1 machine (I've been looking for one for
> years), which has a Tandon TM 502 harddisk in it. Unfortunately, the HDD
> doesn't seem to work :(
> It spins up, by the sounds of it, but is not talking to the computer. There's
> no head noises of any description.> 

Fortunately, the old drives use pretty ordinary componentry, so 
troubleshooting and repair of the electronics board is pretty easy, 
but if the HDA itself has problems, you have a tough job ahead of 

In my experience, the TM502 was an unreliable drive.  One of the 
local parts dealers was using them as doorstops.  When I asked about 
them, he said that he'd sell me his entire stock for $5.  No--not $5 
apiece, but $5 for the entire lot--but I had to take the entire lot.  
These were supposedly working pulls.

I came home with about 20 of the things and was so underwhelmed by 
the reliability of the ones I managed to get working that I scrapped 
the entire bunch.  Life's too short and I felt that I was cheated out 
of $5.

There are better 10MB MFM drives if you can find them.  There's 
nothing magic, IIRC, about the TM502.  I still have old Rodimes and 
CMIs and Seagates, but no Tandons.


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