In comp.sys.ibm.pc.hardware.storage "cquirke (MVP Win9x)" wrote:
On Fri, 12 Mar 2004 19:54:41 GMT, kony wrote:

There is nothing about data transfer that would inherently make it more
susceptible to memory errors...

If the DMA system errors while CPU access does not (think square wave
pulse edges, rise time, local charge pump capacitors etc.) then
MemTest86 et al may pass, while UIDE transfers may fail.

True. But DMA is usually far less agressive in its timing, so
this is a rather unlikely scenario.

Other possibilities:
- buggy VIA 686B Southbridge problem (eats UIDE data)
- bad or noisy UIDE data cables
That should cause CRC errors.
- bad cache RAM on the HD itself
- static buildup on ungrounded HD
No. The HDD is grounded through the power cable and through the
data cable. Unless the whole mainboard is not grounded properly.

The last is something that bit me; a couple of 32-bit errors in the
midst of a 500M bulk file copy, when the loose HD was not touching the
chassis. Grounding the HD solved the problem, hence cause presumption

Strange. The hdd has two low-resistance paths to the chassis.
These should be enough. Hmmm. O.k., so that may cause problems
in some setups. But it cannot be static buildup in the hdd.
Maybe you where statically charged and touched the HDD? That
yould have induced a spike in some logic-lines...

Arno

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