Instantly about SSD
Random reads. This is the SSD disk's major advantage performance-wise. Unlike ordinary disc drives, it is not any mechanism that must be moved around on disk.
Sequential reads & writes.
Several of today's solid-state drives have become very good at this too. On reads some of them twice as quick as a good 7200 RPM's. When it comes to write it is great variation, as some SSD is faster than ordinary HD is, while others are still far behinds.
Random writes and flushes. This is the area the drive have struggled long and much of whit the reason that they are equipped with cache. Most disks can namely not acceptable times by directly writing to the disk. And the problem you still can notice very good in SSD, but this also varies greatly. In fact, random writes and flushes are more difficult to solve optimally with SSD than regular drives.
Improvements in Windows 7
SSD consists of flash blocks and cells. These need to delete actually the content before something new can be written to them. This is the only way to be sure that the cells are 100% empty and that the data will be stored properly. Windows 7 supports the Trim command in the ATA protocol and will use this with disks that say they support it. This means that the disk will be notified if files are deleted and that its cells also can be deleted. This means that the disk can plan in advance and not write to an area also will require an erase first and then go Slower. Trim commands is also integrated with the partition and volume commands to format and delete. This is also to increase the life of cells.
Windows 7 will turn off the defragmentation of the solid-state disks and disks with more than 8 MB / S random reads.
The solid-state drives with good random reads and writes / flushes will Superfetch, ReadyBoost, and boot Prefetching be turned off.
BitLocker Drive Encryption will also be the first encryption to send a Trim command to SSD's for them to get the optimized cells on the disk again after encryption.
It is also built several tests to score drives the necessary reading and writing parameters.
A question that often comes up is whether one should place the page file on a SSD or not?
The answer is yes, most of the operations against this file is random reads or writes or bigger sequential is supported well. Hibernate file, however, written and read in large sequential chunks and can therefore be placed on an ordinary HD or a SSD.
