4.1Standard 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

4.2Media 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.

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Constellation.2 SAS Product Manual, Rev. H

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Seagate ST9500622SS, ST9500621SS, ST9500620SS, 100620418, ST91000642SS, ST91000641SS manual Standard features, Media description