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Powerbook540c & 4GB 2.5 inch IDE 12.5m Hard Drive
Is it possible to connect the subject's hard drive on Powerbook 540c?
No the Powerbook 500 series only work with SCSI drives.
If you're lucky to have bought a PB540c new with a 750MB or 1GB "SCSI" drive, it's a 2.5" IDE hard disk with a SCSI adapter. You can plug in any 2.5" IDE drive < 6GB in there quite happily. The adapter seems to have problems with bigger drives and later ATA standards. The only other option is an ARTMix 2.5" adapter