Buying a hard drive

I'm looking into buying a new [external] hard drive and I don't know what to look for aside from the capacity. I hope you guys can answer my questions below...
- IDE or SATA? What's the difference and what should I get?
- 8MB or 16MB? Obviously 16 is probably going to be better but is the difference worth paying more for?
- USB or firewire? Yeah I plan to have it external and I wonder if there's any major difference.
- Do the brands differ?
I have my eye on a 250GB HD for under $100 or a 500GB for $250, are those good deals?
Lastly, if it makes a difference, consider that I plan to hook it up to my PC first for some video editing projects. In the very near future, I plan to hook it up to my Intel iMac. I'll probably be using the same program to edit my videos (Avid Xpress) so when I hook up the hard drive to the Mac, will it be backwards compatible? (Avid deals mainly with AIF and OMF files).
Thanks in advance!

321estrellas,
IDE and SATA are different connectors. Most iMac models have Serial ATA (SATA) hard disks.
SATA is generally faster, but since you're talking about using it externally, it should make no difference as long as you make sure your enclosure matches the connector (IDE or SATA) of the hard disk.
Why? The limiting factor for speed is the USB or Firewire bus, not the hard drive itself. Both IDE and SATA can push data faster than the bus can transfer it. USB2 claims to push data at 480 and firewire at 400, but these are "burst" rates. Tests I've seen show that firewire has a faster sustained data transfer rate.
Given that your limitation will be the interface, USB or firewire, the cache size on the drive (8 or 16 MB) should not make a significant difference.
(Most firewire enclosures have USB interfaces, as well, so you could retain the choice of interface.)
Advantages for firewire: Faster sustained data transfer rate. Can be used to boot your Mac.
This is counterbalanced by the need to use data from a Windows machine. Unless you're going to make your Windows machine capable of reading and writing to HFS+ formatted disks, you'll have to either use FAT32 on the external (which has its own attendant problems) or wipe and reformat it to HFS+ when you attach it to your Mac to reap the full benefits. (If it will be used exclusively with your Mac, you'll want to use HFS+.)
Brands differ mainly on warranty length. As a rough rule of thumb, if the manufacturer is willing to back it for a longer time, you're getting a better drive. YMMV.
Data file format (AIF, OMF) isn't important as long as you're using the same program to edit the files; hard drive format, as noted above, is. Compatibility is an issue only if you're editing on both a Windows machine and a Mac, or if you're using incompatible versions of the editing software.
-Wayne

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