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Windows 7: Trim on USB3 attached SSD

18 Jan 2011   #11
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

No way James. She is sitting on the purse - all her 95 pounds.

My System SpecsSystem Spec
18 Jan 2011   #12

Win 7 Ultimate x64

OCZ does support TRIM, at least on the Drives they have now. I have a 240 GB Vertex 2 and it does indeed support TRIM. It's also quite fast (270 - 280 Mb/sec read and write times according to the ATTO disk benchmarking utility). Windows gave it a WEI of 7.8 when it was brand new. Now 6 months later after heavy use the WEI has dropped down to 7.7

But whats especially important are the seek times - they are very, very fast. Try .1 msec - yes thats a seek time of 100 microseconds !!!!!! Puts any hard drive to shame (the data transfer rate does too).

And all the SSD features should work whether its attached via SATA or USB. The SATA and USB 3.0 differ a bit on the speed but they are both serial protocols so the commands (ie - TRIM) and the data passed along the serial link should still be the same (logically, not electrically).

We indeed live in exciting times.

Now I hear OCZ has come out with a Vertex 3 with even faster read/write times
My System SpecsSystem Spec
18 Jan 2011   #13

Windows 7 64-bit, Windows 8.1 64-bit, OSX El Capitan, Windows 10 (VMware)

The TRIM is an ATA specification and dependent on the operating system, the latest versions of Linux and Win 7 support TRIM natively. Once the OS recognizes the SSD drive, it'll issue the the TRIM command to the device and the chances are that it'll do so on the USB based SSD as well.

The USB 3.0 SSD, like the OCZ Enyo, is better off with garbage collection (GC) in the firmware and making it independent from the operating system. Will the TRIM also work for the Enyo when it is plugged in a USB 3.0 port on Windows 7? That's a good question and my guess is that the answer is yes.

Windows 7 issuing the TRIM command to an SSD drive is a one-way communication, the OS does not care if the device is acting upon the command. For example the Marvell chipset based SATA 3.0 ports do not support the TRIM command. As such, my SSD drive never actually receives the command. The drive does have GC on the other hand, which works just fine.

Both the SATA 3.0 and USB 3.0 utilizes the 8b/10b encoding for transferring data between the device and host. Since it is the same encoding, the chances are that electronically they are probably the same. Keep in mind that the USB 3.0 does not use hub based communication like the USB 2.0 devices did, at least in high speed mode. While the USB 3.0 does have a pair of non-high speed wires for backward comparability hub/broadcast, the high speed requires two pairs of wires that uses direct protocol to host.
My System SpecsSystem Spec


 Trim on USB3 attached SSD

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