Product Features
WD Scorpio ML160M
20
RELEASED 1/16/09 (WD CONFIDENTIAL)
2679-701205-A00
inactivity timer expires. The Standby Immediate command causes the drive to spin down and
enter a low-power mode. Subsequent disk access commands would cause the drive to spin
up and execute the new command.
To avoid excessive wear on the drive due to the starting and stopping of the HDA, set the
host’s disk inactivity timer to no shorter than ten minutes.
The drives also support the SATA power management feature that lowers the average power
consumption of the SATA interface.
3.10
Dual Drive Support
These hard drives support ATA dual drive operations. You can attach another hard drive to the
WD hard drive designating one as the master and the other as a slave.
These drives support ATA dual drive operations by means of configuration options for master
or slave drive designation. The drive is 100% ATA compatible regarding the timing of the
PDIAG- and DASP- signals. You must place a jumper in the drive’s option area for both
master and slave configurations. If you placed a jumper on the cable select (CSEL) option, the
drive address selection is determined by the CSEL signal on the drive cable. Connection to
the host is implemented by a daisy-chain cable assembly. These configurations are described
in Section 6.
The SDH Register contains the master/slave select bit for the Caviar. The DASP- signal is a
time-multiplexed indicator of Drive Active or Slave Present on the Caviar’s I/O interface. At
reset, this signal is an output from the slave drive and an input to the master drive, showing
that a slave drive is present. For all times other than reset, DASP- is asserted at the beginning
of command processing and released upon completion of the command. If you configured the
master drive option, the drive does not respond to commands or drive status on the interface
when the slave bit is selected in the SDH Register.
3.11
High-Speed DMA Data Transfer Support
These hard drives support all data transfer modes up to Mode 5 Ultra ATA 100. Data transfer
modes supported include PIO modes 0-4, Multi-word DMA modes 0-2, and Ultra ATA modes
0-5.
3.12
Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.)
S.M.A.R.T. helps you monitor a drive’s internal status through diagnostic commands at the
host level.
The drive monitors Read Error Rate, Start/Stop Count, Re-allocated Sector Count, Seek Error
Rate, Power-on Hours Count, Spin-up Retry Count, Drive Calibration Retry Count, Drive
Power Cycle Count, Offline Scan Uncorrectable Sector Count, Ultra ATA CRC Error Rate,
Multi-zone Error Rate, Spin-up Time, Relocation Event Count, and Current Pending Sector
Count. The hard drive updates and stores these attributes in the reserved area of the disk. The
drive also stores a set of attribute thresholds that correspond to the calculated attribute
values. Each attribute threshold indicates the point at which its corresponding attribute value
achieves a negative reliability status.
3.13
Security Mode
The Security Mode feature set allows the user to create a device lock password that prevents
unauthorized hard drive access even if the drive is removed from the computer.
