General Description
(4)Dual SAS port support
The HDDs have two pairs of driver and receiver set (PHY) for the SAS to support dual SAS port connection.
On HDDs, Primary and Secondary Ports on SAS plug connector (2 physical links plus power connections) are used for SAS port connection.
(5)
The maximum
(6)Continuous block processing
The addressing method of data blocks is logical block address. The initiator can access data by specifying block number in a logically continuous data space without concerning the physical structure of the track or cylinder boundaries.
The continuous processing up to
(7)
The data buffer is 16M bytes. Data is transferred between SAS port and disk media through this data buffer. This feature provides the suitable usage environment for users.
(8)Cache feature
After executing the READ command, the HDDs read automatically and store (prefetches) the subsequent data blocks into the data buffer
The high speed sequential data access can be achieved by transferring the data from the data buffer without reaccessing the disk in case the subsequent command requests the prefetched data blocks.
The Write Cache feature is supported. When this feature is enabled, the status report is issued without waiting for completion of write processing to disk media, thereby enabling high speed write processing.
When Write Cache is enabled, you should ensure that the cached data is surely flushed to the disk media before you turn off the HDDs power.
To ensure it, you should issue either the SYNCHRONIZE CACHE command or the STOP UNIT command with specifying “0” to the Immediate bit, and then confirm that the command is surely terminated with the GOOD STATUS.
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