Most of the Maxtor drives I've owned have developed bad sectors within about a year of purchase. No data loss yet, but they shouldn't get new ones, other than those mapped off at the factory.
Hitachi....well, see my sig for my dealings with Hitachi.
I had an IBM 120GXP die of a horrible head crash. The 180GXP replacement may be suffering from the infamous click of death.
I've got some Hitachi drives, model HDS722516VLAT80, of the
Deskstar 7K250 family. I own 5 of them; one of them, I can read its SMART data direcly, the others are on a Promise SX4000 controller. Anyway, the one standalone drive's SMART is reporting 7 pending sectors; this number matches the Reallocated Sector Count. As I interpret this, there are 7 sectors that are currently going bad, but not enough to count as "bad sectors." A full surface scan confirmed this - but the scan also boosted the number of Raw Read Errors detected. So I figure that this Hitachi drive might be having troubles in the future. I am rapidly losing faith in the IBM/Hitachi brand.
Seagate will be my next choice if these Hitachi's decide to die.