Page 3 : SATA 6 Gb/s, What's Under The PCB?
SATA 6 Gb/s
This is a Serial ATA drive, with native support for SATA 6 Gb/s. However, it is backward-compatible so you will have no problem using it with older SATA 3 Gb/s controllers.
The SATA 6 Gb/s interface is necessary for optimal performance since the 8TB WD Gold datacenter drive boasts a maximum sustained internal (platter-to-buffer) transfer rate of 205 MB/s, and a large and fast DDR3 SDRAM cache.
Like all Serial ATA drives, it comes the standard SATA data (left) and power (right) connectors and is hot-pluggable. That means you can connect and disconnect this hard disk drive to the server, computer or NAS while it’s still running.
What’s Under The PCB?
Western Digital has a penchant for keeping all surface-mounted components on the reverse side of the PCB – to prevent static damage and to allow for better cooling. The PCB is protected by a thin foam cutout on the chassis side, with a thermal pad to help transfer heat from the HDD controller to the hard disk drive chassis.
The 8TB WD Gold datacenter drive uses the LSI 7101B hard disk drive controller, and the ST Microelectronics L7229 motor drive controller, which features their proprietary Smooth Drive pseudo-sinusoidal digital drive technology.
The 8TB WD Gold datacenter drive boasts a large 128 MB SDRAM cache, courtesy of a Samsung K4B1G1646G-BCK0 chip. This is a DDR3-1600 SDRAM chip with 8 memory banks and timings of 11-11-11. This gives it a peak transfer rate of 400 MB/s.
Finally, the 8TB WD Gold datacenter drive has two shock sensors that allow it to better detect shock and vibration events, and dynamically adjust the flying height of the read/write heads to avoid head crashes.
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