What is the role of the preamp on a hard drive PCB?

The preamp on a hard drive PCB is responsible for amplifying the weak signals generated by the read/write heads that are used to read and write data on the platters. The preamp amplifies the signal to a level that can be processed by the hard drive's controller chip. The preamp is an essential component of the hard drive, as it enables the read/write heads to accurately read and write data on the platters. If the preamp is damaged or malfunctioning, it can cause data loss or damage to the hard drive.