|Crucial M225 128GB SATA-II SSD CT128M225|
|Reviews - Featured Reviews: Storage|
|Written by Olin Coles|
|Monday, 17 August 2009|
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M225 Internal Components
Lexar/Crucial has designed their M225-series Solid State Drive to use the exact same architecture and components as previously exposed in detail with our OCZ Vertex SSD review. NAND flash module brand and custom firmware modifications are the only differences between the two products internally. For the M225 Internal Components section, we have reused the images from our original inspection of the Indilinx Barefoot controller.
Intermittent and delayed response cycles (stuttering) from Solid State Drive products is not entirely wide-spread among all MLC SSDs, but it has become a big-enough issue among most affordable SSD products that many are well-aware of the phenomenon. Consumers first experienced the bitter taste of stuttering SSD performance with the OCZ Core Series (v1) SSD, although it has also been reported with the G.Skill MLC SSD and Patriot Warp v2. The phenomenon occurs when the drives buffer is filled faster than it can read or write data, and was prevalent among first-generation JMicron JMF602 SSD controllers.
In our OCZ Apex SSD article, Benchmark Reviews detailed how the JMicron JMB390 RAID controller managing a pair of JMF602(B) SSD controllers into a RAID-0 striped array was able to overcome the 'stutter' experienced in MLC drives... at least in read-from functions. OCZ has returned to traditional methods of delivering performance with their latest and greatest Solid State Drive: the OCZ Vertex Turbo. But how will the Vertex Turbo SSD produce read-from and write-to bandwidth on par with the RAID-0 Apex without all the new architecture? The secret lies within a larger buffer, and the retirement of JMicron controllers (at least for this product series) in place of the new Indilinx ARM7 micro-controller.
To the untrained eye, the Crucial M225 SSD looks like every other Solid State Drive you've probably seen when the internal components have been exposed. There's a collective bank of NAND modules, usually with Samsung markings, followed by the SATA controller chip. Crucial decided relies Indilinx to deliver the SATA controller interface, since their 'Barefoot' chip was production-ready to be paired with a large cache months ago, while JMicron is still a few months away with their successor to the less-impressive JMF602B chip.
The internal DRAM is comprised of Samsung K9HCG08U1M-PCB00 IC parts, which bare the branding mark K9HCG08U1M PCB0. These lead-free RoHS-compliant 48-pin ICs are multi-layer, with one IC directly atop another. Each IC has an operating voltage of 2.7-3.6V, with a 25ns speed rating. The K9HCG08U1M parts offer 64GB in 8x organization.
Indilinx claims that their IDX110M00-FC 'Barefoot' chip offer a maximum read speed 230 MBps and supports the capacity up to 512GB with multi-level cell (MLC) NAND flash. The Indilinx (IDX110) Barefoot SSD controller chip is touted as delivering bandwidth over 200 MBps and random input-output (IO) of 20,000/s into various servers such as on-line transaction processing (OLTP) and streaming server units.
A single Elpida 64MB SDRAM module is marked with S51321CBH-7BTT-F, but the actual Elpida part number is EDS51321CBH, which is a 133MHz (CL3-3-3) mobile RAM component. This 64MB cache buffer helps improve small write-to performance and removes the 'stuttering' effect from the Vertex SSD.
The test sample Benchmark Reviews received for our tests came with Indilinx version 1571 (v1.30) firmware, which adds TRIM support in compatible Operating Systems such as Windows 7.
In the next section, Benchmark Reviews begins performance testing the Crucial M225 Solid State Drive, and we determine just how well the new Indilinx Barefoot-based SSD compares to the previous best-performing competition.