Powerbook G4 1.5Ghz and internal 250Gb hard drives

The motherboard BIOS most likely have a hard drive size limit. Yes you can create two or mare partitions to use the rest of the hard drive space.
Go to Control Panel - Administrator Tools - Disk Manager to create a partition and format this partition.

Hello gunsun,

May i know what your problem is?

According to the detailed specs on that model, it came with a 60GB ATA-5 EIDI hard drive. therefore, you can use any ATA compatible (ATA-5, ATA-6 or ATA-100) EIDE/IDE drive that has jumpers enabling you to configure the drive as "Master". Western Digital Blue Scorpio and Seagate Momentus lines both have models that will fit the bill. You can find those drives at your neighborhood BestBuy or Staples pretty easily. I don't know if the A25 BIOS supports 48-bit logical block addressing (LBA), in spite of what toshiba says, If it only supports 24-bit LBA the maximum drive size is 137GB. If it supports 48-bit LBA then you can go as high as you can find drives available; usually 500GB. I suspect that it supports 48-bit LBA because various online vendors list up to 250GB drives for that model. The most important thing about the drive, though, is that it MUST be jumperable as 'master'. A cable select only drive won't work. Both the Western Digital and Seagate EIDE models have jumpers. hope this helps but if you need anything else just ask:)

Try a different computer if it doesn't recognize it either than its fried a tech could still try to take it apart and pull out the internal hard drive to salvage some of the data. good luck

Make sure it is connected properly, normally when this happend it means the USB connection is loose.

yes the PC will not boot when the external driver is connected, thats cause you dont have any boot files on the drive.

Download testdisk and run it to see if it recognised in the list. If so use the intel option to find a boot sector

100% faulty, 100% non repairable

There shouldn't be problems with that.

I think your pc not suported 250gb hard disk