Theory of Device Operation
4.6 Read/write Circuit
The read/write circuit consists of the read/write preamplifier (PreAMP), the write circuit, the read circuit, and the time base generator in the read channel (RDC) block which is integrated into LSI. Figure 4.4 is a block diagram of the read/write circuit.
4.6.1 Read/write preamplifier (PreAMP)
PreAMP equips a read preamplifier and a write current switch, that sets the bias current to the MR device and the current in writing. Each channel is connected to each data head, and PreAMP switches channel by serial I/O. In the event of any abnormalities, including a head
4.6.2 Write circuit
The write data is transferred from the hard disk controller (HDC) to the RDC in LSI. The write data is sent to the PreAMP as differential signal from LSI, and the data is written onto the media.
(1) Write precompensation
Write precompensation compensates, during a write process, for write nonlinearity generated at reading.
Figure 4.4 Read/write circuit block diagram