I just wanted a plug and play model FW HD, quick, before I lost all my data and huge iTunes library, so bought a USB/FW Seagate 400GB, 16mb drive from Freys for $200 + Tax and shipping which was about $30.
Frey's had it mislabeled in their print ad as a 7200.9 model drive, it was an in-between model the 7200.8 with the large 16mb cache. I was warned to watch out for Frey's printed ads being incorrect.
Getting the 5 year warranty would have been nice, but backing up as quickly as possible was the goal and I got kinda stuck figuring out which external case to buy and if I should spend the extra and get a FW/SATA enclosure. So the large plug and play 400GB drive for $200 seemed OK.
A few issues to consider. If one needs the speed, say for video editing, the wave of the future for drives is SATA. This will require a SATA PCI card that matches. Drive's data transfers get theoretically faster with each version 7200.8, 7200.9, and they just released the 7200.10. But I'm not sure what other ancillaries are needed to realize the faster data transfer speeds.
Also, the Seagate comes with an "initio" FW chipset, as compared with the more well known Oxford chip. From what I've read there were various compatibility problems with "initio" chips and some Macs and the initio chips were not tested or recommended with some software, like Super Duper Backup, but it works fine, with my G4 FW. Apparently, earlier initio chip incompatibilities have been addressed. If I had to do it over, I would have got a separate case with the standard Oxford FW chipset.
Also the Bounceback Express that comes with the complete Seagate HD is not Fire Wire bootable unless you buy the more $49/59 full version. I bought Super Duper backup SW for half the price.
I was concerned about the fanless plastic case that came with the Seagate drive, but after using the drive intensively, it runs surprisingly cool and the enclosure seems to be well vented. An enclosure with a fan or heatsinks seem like they would have been unnecessary. Figured Seagate would not put their own drives in cases that ran too hot.
Although the idea of nicely engineered heatsinks inside a case, seem like a good idea, I don't think that modern Seagate drives are run nearly as hot as drives of an earlier vintage did? I've read that heat is the #1 killer of HD's, but it seems like excessive heat problems may have been addressed from within the design of the drives.
I'll wait to buy an external SATA drive and card when prices to come down, when I get a new computer and IF I really need SATA speed for an external, since the internal drives will all be SATA by then. Instead of putting more money into this old G4, when FW works fine for the mainly audio functions I use.
SATA speeds in the future will be really fast for a 150GB back up, which took 3.5 hours from one OWC 250GB Seagate Ext FW 400 drive to the new Seagate FW drive. Having one SATA drive isn't going to make transfers any faster and it's going to cost much more to set up. (if I understand data transfers and bottlnecks correctly).