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4.1
Standard features
Cheetah 15K.6 drives have the following standard features:
• 1.5 / 3 Gbit 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)
• 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 320 bits
• No preventive maintenance or adjustments required
• Dedicated head landing zone
• Embedded servo design
• Automatic shipping lock
• Self diagnostics performed when power is applied to the drive
• Zone bit recording
• Vertical, horizontal, or top down mounting
• Dynamic spindle brake
• 16 Mbyte data buffer
• Drive Self Test
• Background Media Scan
• Power Save
Cheetah 15K.6 SAS FDE models have the following additional features:
• Automatic data encryption/decryption on all writes and reads to and from the media
• Cryptographic erase of user data for a drive that will be repurposed or scrapped
• Two independent data bands which each have it's own ownership credential and encryption key
• Authenticated firmware download
4.2
Media description
The media used on the drive has an aluminum substrate coated with a thin film magnetic material, overcoated
with a proprietary protective layer for improved durability and environmental protection.
4.3
Performance
• Firmware-controlled multisegmented cache designed to dynamically adjust segments for enhanced system
performance.
• 300 Mbytes/sec maximum instantaneous data transfers.
• 15k RPM spindle. Average latency = 2.0 msec
• 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 FDE and non-FDE models.
Cheetah 15K.6 SAS Product Manual, Rev. C
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