Seagate ST3450657SS ユーザーズマニュアル
Cheetah 15K.7 SAS Product Manual, Rev. D
7
4.1
Standard features
Cheetah 15K.7 drives have the following standard features:
• 1.5 / 3
/ 6 Gbit Serial Attached SCSI (SAS) interface
• Integrated dual port SAS controller supporting the SCSI protocol
• Support for SAS expanders and fanout adapters
• Firmware downloadable using the SAS interface
• 128 - deep task set (queue)
• Supports up to 32 initiators
• Jumperless configuration.
• User-selectable logical block size (512, 520, or 528 bytes per logical block)
• Programmable logical block reallocation scheme
• Flawed logical block reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (Post Format)
• ECC maximum burst correction length of 320 bits
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Embedded servo design
• Automatic shipping lock
• Self diagnostics performed when power is applied to the drive
• Zone bit recording
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 16 Mbyte data buffer
• Drive Self Test
• Background Media Scan
• Power Save
• Support for SAS expanders and fanout adapters
• Firmware downloadable using the SAS interface
• 128 - deep task set (queue)
• Supports up to 32 initiators
• Jumperless configuration.
• User-selectable logical block size (512, 520, or 528 bytes per logical block)
• Programmable logical block reallocation scheme
• Flawed logical block reallocation at format time
• Programmable auto write and read reallocation
• Reallocation of defects on command (Post Format)
• ECC maximum burst correction length of 320 bits
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Embedded servo design
• Automatic shipping lock
• Self diagnostics performed when power is applied to the drive
• Zone bit recording
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 16 Mbyte data buffer
• Drive Self Test
• Background Media Scan
• Power Save
Cheetah 15K.7 SAS SED models have the following additional features:
• Automatic data encryption/decryption on all writes and reads to and from the media
• Controlled access
• Random number generator
• Drive locking
• Two independent data bands which each have it’s own ownership credential and encryption key
• Cryptographic erase of user data for a drive that will be repurposed or scrapped
• Authenticated firmware download
• Controlled access
• Random number generator
• Drive locking
• Two independent data bands which each have it’s own ownership credential and encryption key
• Cryptographic erase of user data for a drive that will be repurposed or scrapped
• Authenticated firmware download
4.2
Media description
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated
with a proprietary protective layer for improved durability and environmental protection.
with a proprietary protective layer for improved durability and environmental protection.
4.3
Performance
• Programable multi-segmented cache buffer
• 600 Mbytes/sec maximum instantaneous data transfers
• 15k RPM spindle. Average latency = 2.0 msec
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Adaptive seek velocity; improved seek performance
• 600 Mbytes/sec maximum instantaneous data transfers
• 15k RPM spindle. Average latency = 2.0 msec
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Adaptive seek velocity; improved seek performance