Just so you know, you MIGHT be able to "fix" your 40 gigger by low-level formatting it. I just wouldn't trust it for anything you couldn't afford to loose. (My 45GB IBM did that, and ever since I low-levelled it its been running like a champ!) At any rate, don't fool with RAID unless you plan on buying two of those drives. (RAID stands for Redundant Array of Independent Disks if I remember correctly...) Even so, its only good if you want to have a quick means of backing up your data (Mirroring) or just want to make your computer think that two drives are one really large drive. Here's the kicker though....they must be the exact same size, otherwise you're limited to the smallest size of the two.
more infoNow, as for the hard drive, personally I wouldn't waste money on SATA because you're limited to only one hard drive. The only benefit is the thinner cable, but thats negated by round ribbon cables. Theres no way you'll hit 150MB/sec with current drives so why pay more? The fastest drive I've seen hit just over 70MB/sec on
READ speeds. Write....about 45 - 50MB/sec, and this is an IBM drive (one of the first of the fluid bearing drives). My 160GB Maxtor (both drives are 7200RPM models) gets about the same R/W speeds.