查阅了一下微软，对此的描述如下（英文）：
disabledeletenotify Disables (1) or enables (0) delete notifications. Delete notifications (also known as trim or unmap) is a feature that notifies the underlying storage device of clusters that have been freed due to a file delete operation. In addition:
For systems using ReFS v2, trim is disabled by default.
For systems using ReFS v1, trim is enabled by default.
For systems using NTFS, trim is enabled by default unless an administrator disables it.
If your hard disk drive or SAN reports that it doesn't support trim, then your hard disk drive and SANs don't get trim notifications.
Enabling or disabling doesn't require a restart.
Trim is effective when the next unmap command is issued.
Existing inflight IO are not impacted by the registry change.
Doesn't require any service restart when you enable or disable trim.
