Product Features
XL500S
26
RELEASED 10/21/10 (WD CONFIDENTIAL)
2679-701211-A06
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 drive also supports the SATA power management feature that lowers the average power
consumption of the SATA interface.
3.18
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.
3.19
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. This feature
varies by drive configuration and may not be available on all configurations.
3.19.1
Master and User Passwords
The manufacturer/dealer can set a master password using the Security Set Password
command, without enabling the device lock function. The user password should be given or
changed by a system user.
Master Password Identifier is supported and set to a default value of 00FE. If a Master
Password is set via a Security Set Password Command, a valid Master Password Revision
code value of 0001h – FFFEh must be used. A Master Password Identifier of 0000h is
ignored.
When the master password is set, the drive does
not
enable the device lock function. When
the user password is set, the drive enables the device lock function, and the drive is locked
after the next power on reset or hard reset.
3.19.2
Security Levels
High - If High level security is set and the user password is forgotten, the master password
can be used to unlock the drive and access the data.
Maximum - If Maximum level security is set and the user password is forgotten, data access is
impossible. Only the master password with a Security Erase Unit command can unlock the
drive when the device lock function is enabled and the user password has been forgotten.
When the Security Erase Unit command is used to unlock the drive, all user data is erased.
3.20
Automatic Acoustic Management (AAM)
The AAM feature allows the host to select the acoustic level of the hard drive. When quiet
operation is essential, the drive may be set to operate in the Acoustic Mode to minimize the
hard drive’s sound level.
The Performance Mode results in slightly higher acoustic levels while optimizing the
performance of the drive. The Set Features command is used to set the AAM level.
