Apple 2300C manual

Take Apart	Hard Drive - 26
	5 Using a jeweler’s flat-blade screwdriver, disconnect the
	hard drive cable connector from the hard drive.
	Replacement Note: Before installing the cable on a
	replacement drive, test it on a known-good drive to ensure
	that it is functioning.
	Replacement Note: IDE and SCSI cables are not
	interchangeable. If you replace a cable, make sure you
	install the correct one.