Western Digital VelociRaptor 1TB Review - 10K RPM Hits a Larger Capacity
Specs, Testing Methodology and System Setup
I have a habit of translating Western Digital's marketing speak when we cover specs. I'll continue this trend here. Some of these are not specifically listed by WD, but we know they are in there, so we will keep them here for your education:
- NoTouch™ ramp load technology — Previously called "IntelliPark". Drive heads take an 'exit ramp' off of the platters instead of landing on the platters when the drive is spun down. You know how the most damage is done to your engine when you start it on a cold morning? This means the drive heads do not have to break stiction each and every time the drive spins up. The heads are able to leave the ramp and float onto the spinning disk.
- Native Command Queuing (NCQ) — The drive can reorder groups of reads/writes to minimize overall head movement, and therefore increase effective access time. Beware - this is only effective with an AHCI-enabled SATA controller.
- Perpendicular Magnetic Recording (PMR) — Bits are aligned vertically instead of horizontally to get more packed onto each platter. Think dominoes (the game, not the food).
- 64MB cache — Up from 32MB on the 600GB and 16MB on the 300GB VR. Increased cache helps boost random access performance.
- Dual processors — Introduced with the RE4-GP line, the additional core helps the drive keep track of the added cache and increased throughput streaming off of the head pack.
- RAID-specific time-limited error recovery (TLER) — The drive limits the 'hang' experienced on a read error in order to avoid a RAID controller considering the drive dead / offline.
- Rotary Acceleration Feed Forward (RAFF™) — Rotary Acceleration Feed Forward (RAFF) takes the input from sensors mounted on the drive chassis and uses that data to help keep the head on track. This keeps the heads where they are supposed to be for more of the time (ideally *all* of the time).
- Memory path protection — The data path architecture has been modified to prevent silent data corruption along the internal data buses (i.e. parity bits).
- Advanced Format — Introduced back in late 2009, this increases storage efficiency and robustness by having the drive handle data as 4KB internal blocks. This means error correction routines are not limited to 512B segments. ECC works better on larger chunks of data, and this gives an ~50% improvement in that area. The trade-off is random access fr blocks <4KB will suffer, but this is not much of an issue as the vast majority of file access is >= 4KB.
The load/unload spec (for the ramp load technology) remains at 600,000 cycles.
Specific to this Review
We are currently using a Sandy Bridge test bed. We are using only the Intel SATA 6Gb/sec ports or any unit under test. PC Perspective would like to thank ASUS, Corsair, and Kingston for supplying some of the components of our test rig.
|Hard Drive Test System Setup|
|CPU||Intel Core i5-2500K|
|Motherboard||Asus P8Z68-V Pro|
|Memory||Kingston HyperX 4GB DDR3-2133 CL9|
|Hard Drive||G.Skill 32GB SLC SSD|
|Video Card||Intel® HD Graphics 3000|
|Power Supply||Corsair CMPSU-650TX|
|Operating System||Windows 7 X64|
- PCPer File Copy Test