Just see this title, many users will have a question: What is the SSD, what is the difference between it and the ordinary hard disk? In fact, simply use solid-state electronic memory chips The hard disk made by the array, the interface specification and definition, function and usage of the solid state hard disk are the same as those of the ordinary hard disk, and the shape and size of the product are also consistent with the ordinary hard disk. Since the launch of Windows7, he began picking up solid-state drive, solid state drive Microsoft also put on a key position, and now give you about a new system for SSDs appropriate optimization measures.
a solid-state hard disk performance degradation operating
flash memory block (block) and Trim request page (page) and cell (cell) must first be erased to write new data, so buy a new SSD performance is very good, but with time When you grow up, you can feel a decline in performance. Intel has tried to solve it by upgrading the firmware.
Microsoft said that they also observed this phenomenon, but we did not imagine so serious, in fact, devoted to the benchmark tests in addition to the user in the daily operations of the basic feel different.
Of course, manufacturers are still obliged to maximize the maintenance of high performance. The hardware manufacturer first completely erases the SSD before it leaves the factory (similar to the low-level formatting of the hard disk), and the second is to prepare a special space for dense burst writes. The enterprise hard drive will even reserve up to 50% for this purpose. Space to maintain a high sustained write speed for a long time.
Microsoft also used in combination with solid-state drive vendors, a "Trim" mechanism. In Windows 7, if the SSD report supports the Trim attribute in the ATA Protocol Data Set Management (DSM) command, the NTFS file system will ask the ATA driver to issue a new Trim operation command to the SSD when the user deletes the file, telling it to be relevant. The page can be safely erased. After the SSD gets this indication, it will not rush to perform the erase operation, but wait for the right opportunity, that is, when there is a write operation again, because the relevant page can be reused at this time, there is no need to perform the wipe. Except for the operation.
For example, if a block size of 128KB memory stood a 128KB file, if the file is deleted and perform Trim operation, solid-state hard drive can prevent this block and this byte The other bytes required for subsequent writes to the block are mixed, which greatly reduces the "wear" of the solid state drive.
in Windows7 in, Trim the request is not limited to deletion, but also to partition and volume level commands, file system commands, the System Restore feature fully integrated.
two, Windows7 optimization and the default behavior outlined
on SSDs, Windows7 will disable the Disk Defragmenter, because solid-state disk random read a good operation mechanism, organize file fragments will not What help?
Windows7 will disable SuperFetch SSDs default, ReadyBoost, and start-up and procedures prefetching, these features are designed for traditional hard drives.
Windows7 built-in partition creation tools will also consider the characteristics of solid state drives. Of course, it's best to put the system partition on a solid state drive.
Third, the common problem doubts
1, Windows7 will support the Trim Why?
support. See above.
2, in the solid-state hard disk will be disabled by default defrag Why?
will. Windows 7 defragmentation will exclude SSD partitions, and if the hard disk partition random read performance exceeds 8MB/s, defragmentation will ignore it.
8MB /s Microsoft's internal analysis of this indicator is obtained, will be added in the final version of the system. In fact, this rule is of little significance, because the SSDs are generally 11-130MB/s, and the 182 traditional hard disks tested only have more than 2MB/s, and all others are at 0.8-1.6MB/s.