I'm not sure if this is the right venue for this sort of question, but hey, who knows...
I am currently on my third SCSI CD-RW drive, in just the last six months. The first experienced a failure in the head mechanism, and the second... I'm not entirely sure. Third time's a charm, right?
Not wanting to purchase another drive anyime soon, I'm investigating any possible issues that might be contributing to their premature demise.
The logical SCSI chain looks like this:
My one area of concern is with "TERMPWR," the (approx.) +5V used to power the SCSI-bus terminators. Depending on which conflicting information you happen to stumble upon, it should either be supplied by just one device, or by every device in the chain. From what I gather, unless the SCSI chain is significantly lengthy, having a single provider seems to be the best practice.
As fate would have it, every single device
in my chain supplies ~1A TERMPWR. But, is that a problem?
Most SCSI-2+ devices have a diode to protect against reverse current, but suppose the diode in the CD-RW was of an incorrect rating; what type of failure might result?
In any event, the current drive is a later model than the prior two (PX-W124TSI), so one can only hope that, for this reason alone, it might be more reliable...