Seagate ST33000650SS, ST33000652SS, ST33000651SS Standard features, Media description, Performance

4.1Standard features

Constellation ES.2 drives have the following standard features:

•Perpendicular recording technology

•1.5 / 3.0 / 6.0 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 size (512, 520 or 528 bytes per logical block).

•Industry standard 3.5-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 400 bits

•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

•64 MB data buffer (see Section 5.5).

•Drive Self Test (DST)

•Background Media Scan (BMS)

•Idle Read After Write (IRAW)

•Power Save

Constellation® ES.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 aluminum substrate coated with a thin film magnetic material, overcoated with a proprietary protective layer for improved durability and environmental protection.

4.3Performance

•Programmable multi-segmentable cache buffer

•600MB/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

Note. There is no significant performance difference between Self-Encrypting Drive and standard (non- Self-Encrypting Drive) models.

8 Constellation ES.2 SAS Product Manual, Rev. D