Seagate ST2000NM0054 ユーザーズマニュアル

Seagate Enterprise Capacity 3.5 HDD v4 SAS Product Manual, Rev. C

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Enterprise Capacity 3.5 HDD v4 drives have the following standard features:
• Perpendicular recording technology
• 1.5 / 3.0 / 6.0/12.0 Gb 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 sizes for 5xxE (512, 520, 524 or 528 bytes per logical block).
• User-selectable logical block sizes for 4KN (4096, 4160, 4192 or 4224 bytes per logical block).
• Industry standard SFF 3.5-in dimensions
• 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) 
• No preventive maintenance or adjustments required 
• Embedded servo design
• Dedicated head load/unload zone
• Self diagnostics performed when power is applied to the drive 
• Vertical, horizontal, or top down mounting 
• 128 MB data buffer (see Section 4.4).
• Drive Self Test (DST)
• SAS Power Disable
• Power Save
• Seagate RAID Rebuild

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• Idle Read After Write (IRAW)

Seagate Enterprise Capacity 3.5 HDD v4 SAS Self-Encrypting Drive models have the following additional features:
• Automatic data encryption/decryption
• Controlled access
• Random number generator
• Drive locking
• 16 independent data bands
• Cryptographic erase of user data for a drive that will be repurposed or scrapped
• Authenticated firmware download

The media used on the drive has a aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary protective 
layer for improved durability and environmental protection.

• Programmable multi-segmentable cache buffer 
• 1200MB/s maximum instantaneous data transfers.
• 7200 RPM spindle. Average latency = 4.16ms
• Background processing of queue
• Supports start and stop commands (spindle stops spinning)
• Adaptive seek velocity; improved seek performance

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• Annualized Failure Rate (AFR) of 0.44%
• Mean time between failures (MTBF) of 2,000,000 hours
• Balanced low mass rotary voice coil actuator
• Incorporates industry-standard Self-Monitoring Analysis and Reporting Technology (S.M.A.R.T.)
• 5-year warranty

There is no significant performance difference between Self-Encrypting 

Drive and standard (non-Self-Encrypting Drive) models.