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A trim command (known as TRIM in the ATA command set, and UNMAP in the SCSI command set) allows an operating system to inform a solid-state drive (SSD) which blocks of data are no longer considered to be "in use" and therefore can be erased internally. [1] Trim was introduced soon after SSDs were introduced.
While Windows 7 supported automatic TRIM for internal SATA SSDs, Windows 8.1 and Windows 10 support manual TRIM as well as automatic TRIM for SATA, NVMe and USB-attached SSDs. Disk Defragmenter in Windows 10 and 11 may execute TRIM to optimize an SSD.
SSD Manufacturers that did not originally build TRIM support into their drives can either offer a firmware upgrade to the user, or provide a separate utility that extracts the information on the invalid data from the OS and separately TRIMs the SSD. The benefit would be realized only after each run of that utility by the user.
In Windows, the user can use the tool like ATATool to create a DCO. The user can set DCO to 100GB on hard drive 1: ATATOOL /SETDCO:100GB \\.\PhysicalDrive1 The user can remove DCO of 100GB on hard drive 1: ATATOOL /RESTOREDCO:100GB \\.\PhysicalDrive1 These commands can cause data loss or worse if they exeute this command that contains data. [6]
X25-M G2 Trim command support was released for Windows 7. Trim support gives the SSD the ability to take the memory that is marked to be deleted to erased immediately. This gives the drive more space to reuse, and reduces performance loss over time.
Windows Vista and Windows 7 also natively support AHCI, but their AHCI support (via the msahci service) must be manually enabled via registry editing if controller support was not present during their initial install. Windows 7's AHCI enables not only NCQ but also TRIM support on SSD drives (with their supporting
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X79 is the Enterprise version, called RST-E. With the RST ROM added to the BIOS, this allows TRIM function to pass through the controller and TRIM SSD drives when RAID is enabled. This workaround was needed before RST-E driver version 3.8 was shipped which passed through TRIM commands to a RAID array without modifications to the RST-E ROM.