Fujitsu MHC2040AT, MHC2032AT, MHD2021AT, MHD2032AT manual Features

1.1 Features

1.1.3 Interface

(1) Connection to interface

With the built-in ATA interface controller, the disk drives (the MHC Series and MHD Series) can be connected to an ATA interface of a personal computer.

(2) 512-KB data buffer

The disk drives (the MHC Series and MHD Series) uses a 512-KB data buffer to transfer data between the host and the disk media.

In combination with the read-ahead cache system described in item (3) and the write cache described in item (7), the buffer contributes to efficient I/O processing.

(3) Read-ahead cache system

After the execution of a disk read command, the disk drive automatically reads the subsequent data block and writes it to the data buffer (read ahead operation). This cache system enables fast data access. The next disk read command would normally cause another disk access. But, if the read ahead data corresponds to the data requested by the next read command, the data in the buffer can be transferred instead.

(4) Master/slave

The disk drives (the MHC Series and MHD Series) can be connected to ATA interface as daisy chain configuration. Drive 0 is a master device, drive 1 is a slave device.

(5) Error correction and retry by ECC

If a recoverable error occurs, the disk drives (the MHC Series and MHD Series) themselves attempt error recovery. The ECC has improved buffer error correction for correctable data errors.

(6) Self-diagnosis

The disk drives (the MHC Series and MHD Series) have a diagnostic function to check operation of the controller and disk drives. Executing the diagnostic command invokes self-diagnosis.

(7) Write cache

When the disk drives (the MHC Series and MHD Series) receive a write command, the disk drives post the command completion at completion of transferring data to the data buffer completion of writing to the disk media. This feature reduces the access time at writing.

C141-E050-02EN 1-3