Much of this is due to bandwidth limitations of the SATA 3G transfer standard. According to CNET Microsoft sees another area of concern inside the OS itself. To improve on this Redmond is going to be adding in code to ID your SSD and optimize performance for this
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In a conference abstract titled "Windows 7 Enhancements for Solid-State Drives," Microsoft states that "PC systems that have solid-state drives are shipping in increasing volumes" and that it is planning "Windows enhancements that take advantage of the latest updates to standardized command sets, such as ATA."
"Windows7 will be able to identify a SSD uniquely," according to Gregory Wong of Forward Insights. Certain ATA commands will improve the speed that solid state drives write to disk, Wong said.
ATA is most commonly associated with Serial ATA, or SATA, technology, which is the most popular data transfer standard for PC storage devices. Most new hard drives use the SATA-2 standard, and the newest solid-state drives are based on this standard also.
Until recently, solid-state drives used an older--and theoretically slower--PATA (Parallel ATA) standard. But the newest drives shipping with, for example, the Dell Latitude E4200 and HP EliteBook 2530p ultraportable laptops, use SATA-2.