Using a removed G4 Powerbook hard drive with an MBA.

Hi
When my G4 Powerbook finally died I removed (carefully) the hard drive and fitted it into a caddy. Plugging the caddy's USB lead into my new MBA however does not produce any result. Any tips on how I retrieve the files from the old hard drive? Thanks

Thank you both.
I am aware of the radical difference in processors and was never intending to try to boot the Air from the G4 drive, only to recover the files - mainly .doc and Appleworks files with a few photos, tunes and one or two video clips. (Yes, I know I should have backed them up more regularly!)
When I plug the caddy's lead into the Air a red LED on the caddy comes on. Nothing appears on the desktop - I've never been entirely clear what it means to speak of a drrive "mounting". My G4 always had a " Macintosh HD" icon on the desktop, but I've chosen not to have that dispalyed on the MBA.
Disk Utility seems to show two drives but I think they're actually the same - at least in the primitive sense in whiish I use the phrase "hard drive". The top line of the side bar in Disk Utility shows a drive icon and next to it says "121.33 GB Apple SSD" Assuming that SSD means Solid State drive and given the size this must be the Air's own internal drive. (confirmed by the mention of GUID partition table in the description to the lower right of the Disk Utility window. On the line below, but indented as if subsumed under the top line, the same icon appears agian with "Macintosh HD" next to it. However, highlighting that brings up the information that this has a Capacity of 120.47 GB. Since my G4 had a 60GB hard disk I think this second line must also be refering to the internal drive in the MBA.
I know, of course, that the G4's drive may be extinct, though when the Powerbook was trying to start the drive would at least spin!
I'll appreciate any other suggestions you could come up with and in the meantime get back to the retailer I bought the caddy from to see if they can answer the questions canadacam39 raises.
Thanks again

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