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8 Constellation.2 SAS Product Manual, Rev. H
4.1 Standard features
Constellation.2 drives have the following standard features:
• Perpendicular recording technology
• 1.5 / 3 / 6 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 size (512, 520 or 528 bytes per logical block).
• SAS-SED models ST91000641SS and ST9500621SS.
• SAS-SED (FIPS 140-2) models ST91000642SS and ST9500622SS.
• Industry standard SFF 2.5-inch 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)
• ECC maximum burst correction length of 444 bits
• No preventive maintenance or adjustments required
• Embedded servo design
• Automatic shipping lock
• Dedicated head load/unload zone
• Self diagnostics performed when power is applied to the drive
• Zone bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 64 Mbyte data buffer (see Section 5.5).
• Drive Self Test (DST)
• Background Media Scan (BMS)
• Idle Read After Write (IRAW)
• Power Save
Constellation.2 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
4.2 Media description
The media used on the drive has a glass substrate coated with a thin film magnetic material, overcoated with a
proprietary protective layer for improved durability and environmental protection.