Traxdata Ultra-S Plus 64GB SLC SSD

SSD are inherently better than conventional hard disks right? We pitch an SLC-technology based SSD drive against a regular one to see how it fares.

Price
£599

Solid State Discs (SSDs) are one of the big new arrivals on the technology scene for 2008, reaching a price and a performance level that is beginning to make them a serious proposition in business computing. So when Traxdata popped by the offices bearing one of their latest drives in tow, we thought it would be a good opportunity to test one in our own labs to see how it would fair.

SSD stands for Solid State Drive a hard disk with no moving parts, which has a number of benefits. Firstly, with no moving parts, SSD drives are inherently much more more robust. Secondly, with no physical parts to move around, SSDs are always promoted as drawing less power than their more conventional stablemates. Thirdly, the natural assumption is that performance is inherently greater that 'normal' hard disks, just as the RAM chips in your PC are much faster than the moving parts in your hard disk.

Of course there are drawbacks, and with SSDs there are two big ones capacity and price.

While your average hard disk will come in these days anywhere from 200GB up to 1TB, the solid state hard disk will only come in either 64, 128 and 256GB capacities, which are obviously much more limiting in what you can place on there. However, for certain applications it's a no-brainer to employ SSDs over hard disks. As such, they have also really started to find a place in enterprise, where the performance and power savings really make sense.

The other area is price. Relatively recently SSDs have started to appear in laptops with their inherent benefits making them a good fit, literally, for laptops, but you have to pay quite a premium to get one. The big names to feature SSDs where Apple with its MacBook Air, and currently this costs 1,105 excluding VAT with a standard 120GB 4,200rpm hard disk, but this goes up by 343 for a 128GB hard disk.

Equally Lenovo's X300, is available exclusively with an SSD drive and cost nearly 2,000 when it was first released, though this has since come down to around 1,200. SSDs have also become a pretty common feature in many netbooks.

However, not all SSDs are created equal. There's are actually two distinct types Single Layer Cell (SLC) and Multi Layer Cell (MLC). SLC's store one-bit of data per memory cell, which produces faster transfer speeds, lower power consumption and because they are single cell are more robust.

MLC's meanwhile store multiple bits per cell, which makes it easier to create larger capacity drives for lower cost, at the expense of performance and ultimate robustness. The reason for the former is that it becomes more complex to extract the correct data from each cell, while for the latter in the event of a cell becoming unreadable more data could potentially be lost.

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