The wait is over. TRIM feature is available in Windows 7.
Microsoft and Solid State Drives (SSD) manufacturers are adopting the Trim operation. In Windows 7, if an SSD reports it supports the Trim attribute of the ATA protocol’s Data Set Management command, the NTFS file system will request the ATA driver to issue
the new operation to the device when files are deleted and it is safe to erase the SSD pages backing the files. With this information, an SSD can plan to erase the relevant blocks opportunistically (and lazily) in the hope that subsequent writes will not require
a blocking erase operation since erased pages are available for reuse.
As an added benefit, the Trim operation can help SSDs reduce wear by eliminating the need for many merge operations to occur. As an example, consider a single 128 KB SSD block that contained a 128 KB file. If the file is deleted and a Trim operation is requested,
then the SSD can avoid having to mix bytes from the SSD block with any other bytes that are subsequently written to that block. This reduces wear.
Windows 7 requests the Trim operation for more than just file delete operations. The Trim operation is fully integrated with partition- and volume-level commands like Format and Delete, with file system commands relating to truncate and compression, and
with the System Restore (aka Volume Snapshot) feature.
Refer the link below for detailed explanation on SSDs:
With Windows 7, the operating system file system will determine if your drive (SSD) has native TRIM support and configure it accordingly.
Note that the firmware in the SSD has to support TRIM. Contact the manufacturer for details related to TRIM support with your SSD.
A firmware upgrade may correct the problem as more and more SSD manufacturers are now implementing this essential feature in the form of BIOS updates for older drives and natively in new drives. Check your drive's site for possible upgrades.
Hope this helps!
Gokul - Microsoft Support
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