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Product Features
3.11 Femto Slider
These drives incorporate the femto slider form factor in which the read/write head is
mounted on the small, lightweight femto slider which allows the head to move more
quickly from track to track on the disk. WD's femto heads enhance tracking and
increase shock tolerance, producing a highly stable high-density drive platform.
3.12 S.M.A.R.T. Command Transport (SCT)
The SCT Command Transport feature set provides a method for a host to send
commands and data to a device and for a device to send data and status to a host
using log pages. Standard ATA commands may be interspersed with SCT commands,
but SCT commands cannot be nested. SCT commands that do not require a
subsequent data transfer operation are not interspersed with any ATA commands or
each other.
The SCT Command Transport feature set provides a method for a host to send
commands and data to a device and for a device to send data and status to a host
using log pages. This capability is used to pass commands through a driver interface
or a bridge where new or unknown commands may be filtered and not passed to the
drive. SCT is also used for issuing commands that require more than 8 parameter
bytes. ATA8-ACS provides detailed information on the usage and capabilities of SCT.
The SCT feature set includes the following commands:
Write Same
Temperature Reporting
3.12.1 Write Same
The Write Same command allows the host to erase the media, or write a pattern
repeatedly across the media, with a minimum of data transfer from the host. The host
can clear the entire media to zeros or a specific pattern by sending this command
with the pattern as a parameter—no data transfer is necessary. Write Same can write
the entire media, or just a portion of the media. The host can monitor the progress of
the Write Same by issuing SCT Status requests. This frees the host system to do other
tasks while the media is being cleared.
3.12.2 Temperature Reporting
The SCT Temperature Reporting (SCT TR) feature allows a host system to access
temperature information in the drive. The S.M.A.R.T. temperature value is reported
within ±3°C of the base casting temperature. This information can been used to
control fans or adjust the usage of various system components to keep the drive
within its normal operating temperature. Applications include Enterprise, Laptop,
Desktop and Consumer Electronics. SCT TR reports the maximum and minimum
sustained operating limits, warning level limits, and drive damage limits. In addition to
reporting the limits, SCT TR returns the current drive temperature (a temperature
history which the host can use to predict heating or cooling trends) and the maximum
temperature achieved during the lifetime of the drive as well as the highest
temperature achieved since the power was applied to the drive. Detailed information
on this capability can be found in ATA8-ACS.
16
RELEASED 5/4/17 (WD CONFIDENTIAL)
WD Purple™ PR1200M
2679-800065-A03
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