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SEAGATE ENTERPRISE PERFORMANCE 15K HDD AND ENTERPRISE TURBO SSHD SAS PRODUCT MANUAL, REV. B 7
3.1 Standard features
Enterprise Performance 15K HDD and Enterprise Turbo SSHD 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 for 512N/512E (512, 520, 524, or 528 bytes per logical block)
• User-selectable logical block size for 4k (4096, 4160, 4192, or 4224 bytes per logical block)
• Industry standard SFF 2.5-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)
• ECC maximum burst correction length of 520 bits for 512 byte blocks and 1400 bits for 4k byte blocks
• No preventive maintenance or adjustments required
• Dedicated head landing 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)
• 32GB hybrid read cache
• 8MB Hybrid NVC-backed write cache
Approximately 512K on standard models (512E, 4K)
• Drive Self Test (DST)
• Background Media Scan (BMS)
• Idle Read After Write (IRAW)
• Power Save
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
3.2 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.
3.3 Performance
• Firmware-controlled multisegmented cache designed to dynamically adjust segments for enhanced system performance
• 600 MB/s maximum instantaneous data transfers
• 15K RPM spindle. Average latency = 2.0 ms
• 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.