Hard Drive Error Disk or Motherboard?

[Mel]

Alan wrote:


>   Controller<=====Longest Part of cable===>Drive2<===Short bit===>Drive1

If I remember my cable theory correctly, all cables should be terminated 
in their characteristic impedance at both ends. If not, then reflections 
occur.

The higher the frequency, the greater effect they have on reliable use 
of the cable. As you said, cable length is also a factor.

Isn't this what "Time Domain Reflectromitry(SP?)" is based on?