 The TRIM operation is fully integrated with partition- and volume-level commands such as "format" and "delete", with file system commands relating to truncate and compression, and with the System Restore (also known as Volume Snapshot) feature.Windows Vista generally expects hard disk drives rather than SSDs.Windows Vista includes ReadyBoost to exploit characteristics of USB-connected flash devices, but for SSDs it only improves the default partition alignment to prevent read-modify-write operations that reduce the speed of SSDs.