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Seagate Enterprise Capacity 2.5 HDD v3 SAS Product Manual, Rev. D 10
3.0 General description
Enterprise Capacity 2.5 HDD v3 SAS drives provide high performance, high capacity data storage for a variety of systems including
engineering workstations, network servers, mainframes, and supercomputers. The Serial Attached SCSI interface is designed to meet
next-generation computing demands for performance, scalability, flexibility and high-density storage requirements.
Enterprise Capacity 2.5 HDD v3 drives are random access storage devices designed to support the Serial Attached SCSI Protocol as
described in the ANSI specifications, this document, and the SAS Interface Manual (part number 100293071) which describes the general
interface characteristics of this drive. Enterprise Capacity 2.5 HDD v3 drives are classified as intelligent peripherals and provide level 2
conformance (highest level) with the ANSI SCSI-1 standard. The SAS connectors, cables and electrical interface are compatible with
Serial ATA (SATA), giving future users the choice of populating their systems with either SAS or SATA hard disk drives. This allows
integrators to continue to leverage existing investment in SCSI while gaining a 12Gb/s serial data transfer rate.
The Self-Encrypting Drive models indicated on the cover of this product manual have provisions for “Security of Data at Rest” based on the
standards defined by the Trusted Computing Group (see
www.trustedcomputinggroup.org).
The head and disk assembly (HDA) is sealed at the factory. Air recirculates within the HDA through a non-replaceable filter to maintain a
contamination-free HDA environment.
Enterprise Capacity 2.5 HDD v3 drives use a dedicated load/unload zone at the outermost radius of the media to eliminate the possibility
of destroying or degrading data by landing in the data zone. The heads automatically go to the ramp load/unload when power is removed
from the drive and during the deeper sleep modes.
An automatic shipping lock prevents potential damage to the heads and discs that results from movement during shipping and handling.
The shipping lock disengages and the head load process begins when power is applied to the drive.
These drives decode track 0 location data from the servo data embedded on each surface to eliminate mechanical transducer adjustments
and related reliability concerns.
The drives also use a high-performance actuator assembly with a low-inertia, balanced, patented, straight arm design that provides
excellent performance with minimal power dissipation.
3.1 Standard features
Enterprise Capacity 2.5 HDD drives have the following standard features:
• 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 16 initiators
• NVC- backed write cache of approximately 334K
• Jumperless configuration
• User-selectable logical block sizes for 512E and 512N models (512, 520, 524 or 528 bytes per logical block)
• User-selectable logical block sizes for 4096N models (4096, 4160, 4192 or 4224 bytes per logical block)
• 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 524 bits for 512 byte blocks and 4108 bits for 4k byte blocks
• No preventive maintenance or adjustments required
• Dedicated head load/unload zone and automatic shipping lock
• Embedded servo design
• Automatic shipping lock
• Self diagnostics performed when power is applied to the drive
• Zone bit recording (ZBR)
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 128MB data buffer (see Section 4.5)
• Drive Self Test (DST)
Note
Never disassemble the HDA and do not attempt to service items in the sealed enclosure
(heads, media, actuator, etc.) as this requires special facilities. The drive does not contain
user-replaceable parts. Opening the HDA for any reason voids the warranty.