What is SSD TRIM?
By submitting your email address, you agree to receive emails regarding relevant topic offers from TechTarget and its partners. You can withdraw your consent at any time. Contact TechTarget at 275 Grove Street, Newton, MA.
SSD TRIM is a SATA interface function that tells a SATA-interface flash SSD to begin a process of “garbage collection” using the program/erase cycle functions, usually as a background task. When a file is deleted from a computer, almost all operating systems simply delete the table of contents entry, but do not delete the actual data blocks from the storage media. For flash SSDs, this leaves unneeded data blocks on the flash media that will eventually need to be overwritten.
With TRIM, the operating system can direct a flash SSD to begin deleting unused blocks when the file is marked for deletion either immediately or as a background task. The goal is that unneeded blocks will be erased before they are needed, so that when writes occur later as files or data elements are saved, there will be plenty of empty blocks available for writing that don’t need to be erased first. Some, but not all operating systems support SSD TRIM natively today. In addition, many of the SSD vendors provide a utility application that can be run to accomplish this purpose. UNMAP is the equivalent term for SAS-interface SSDs.
Dig Deeper on Solid state storage technology
Related Q&A from Dennis Martin
RDMA technology can help speed up I/O in storage environments by bypassing copy processes in the software stack when data is called up from a ...continue reading
Remote Direct Memory Access is a good way to reduce latency in flash environments and works with InfiniBand and some Ethernet connections.continue reading
Dennis Martin of Demartek discusses creating DIY hybrid SSD arrays by adding flash drives to an existing array.continue reading
Have a question for an expert?
Please add a title for your question
Get answers from a TechTarget expert on whatever's puzzling you.