With so many solid-state drive producers jumping aboard the Sand Force bandwagon, competition is turning more and more fierce, particularly as completely company is fix on carving out a component of lucrative solid-state drive pie. ADATA is the new entrant onto the market, with its S511 rate of SSDs appearing to offer the most cheap route to the SandForce 2281’s 500MB/sec read velocities.


As we have look with the OCZ Agility 3 240GB, using a SandForce 2281 drive controller does not always mean super-fast process. In the case of the Agility, this was due to its use of asynchronous NAND, which appeared incompressible data function suffer dramatically. The S511 uses synchronous 25nm Intel NAND, same to the OCZ Vertex iii 240GB, with 16 Intel 16GB NAND examples fitted to its PCB for an entire of 256GB. As we got with the Patriot Wildfire, utilizing fancy and costly 32nm NAND alongside the Sand Force 2281 controller does not make much more velocity, so the 25nm synchronous choices looks to be the nice spot.


However, as with entire SandForce-based solid-state drives, the S511 is over-provisioned to create room for SandForce’s on-board fault-correction system, and to permit for continued function should some of the NAND fail. This

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is the conclusion that the drive's power is advertised as 240 GB instead than 256GB, and why it boasts a formatted capacity of 224GB; 14% of the available NAND is reserved for over-provisioning.


This over-provisioning permits memory to be fix aside for SandForce’s DuraWrite compression tech. This is the key to the drive controller’s high function, as its on-the-fly compression changes it to write without information than the operating system originally gives it, reporting back the impressive (and commonly so high) velocities.


However, this system too means that when managing informations that is already heavily compressed, such as pictures, videos and many game and software documents, the drive functions at a much lower velocity than the excellent-case maximum. With quoted velocities of 550MB/sec for sequential reads and 520MB/sec for sequential writes, the S511 copes with many competing SandForce 2281 drives for claimed functions.


While the S511 may be identical in its drive controller, NAND and formatted ability to the Vertex 3, its largest advantage is its cost.It is through long the excellent-value SandForce 2281-based drive we have expected.


Contempt the similarities in conditions of hardware, however, the S511 is different to process identically to the Vertex iii 240GB due to the dissimilar firmware editions of the drives. Our answers are founded on the 319ABBF0 firmware of the S511 and the new v2.11 firmware of the Vertex 3.