The latest issue of MaximumPC contained a report titled "Your 10 Most Burning Hard Drive Questions" These questions were directed to various HD suppliers. I am posting several that I found of interest or have been discussed in TZ forums.
If I drop a HD and it still works, should I replace it anyway?
Segate - If you drop a drive that is not in operation, you should run a diagnostic utility such as Seagate's SeaTools. If the diagnostic says the drive is OK, you can safely keep and use the drive.
Who needs SCSI these days?
Hitachi - SCSI will continue to be an important interface for use in RAID and other enterprise environments.
Western Digital - Nobody really - high performance and high reliability are both available with Serial ATA. Of course if you are feeling charitable and wish to give money away, then feel free to buy SCSI components.
What are the most common symptoms of impending drive failure?
Seagate - If you see a recurring problem within an application whenever it loads or executes a particular function, that may be your hint that it's time to run a hard drive diagnostic program like Segate SeaTools. Metalic or grinding noises mean you should immediately adopt a backup plan.
Do rounded parallel ATA cables affect drive performance?
Segate - Yes, ... they potentially increase crosstalk.
Western Digital - Yes, for the same reason.