I discovered, amidst great initial pain, that most, if not all, of the problems I had with SATA disks were caused by SATA cables and not by the disks themselves. Intermittent problems, such as disks randomly not showing up in RAID groups, were solved when I replaced the cables with proper ones. Some of the bad cables even came from well known names.
Coincidence or not, all of the cables I had problems with were of the same general type: thin and covered with wrapped aluminum foil. I don't think I ever had problems with the flat, wider ones.
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