Hey all I have a 14" iBook G3 900mhz(last of the G3 iBooks) whose hard drive just failed. I was playing the Sims & the computer got really warm, & then the game froze... I could hear the hard drive clicking away but it never did "un freeze" So I re-booted the machine & was faced with the missing sysem folder icon. So I booted the machine with the OS X disk & tried to run disk utility ... it recognized that there was a drive, but couldnt do anything to it. I've decided to replace the original Toshiba 40gig drive (MK4021GAS) with a larger 80-100gig drive, but all the drives that I can find are ATA-6 drives & the specs on my current drive show that it's an ATA-5 drive. What are the differences between ATA-5 & 6 and can I use the ATA-6 drive in my machine? thanks -Don