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Disable Win 7 TRIM on Intel US15W chipset Netbooks


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I'm creating a new thread for this issue on the hope that with the proper keywords I can save someone the week it took me to figure out that you can't effectively execute the TRIM command in a Win 7 system installed on an Atom CPU. Which means that the majority of netbooks (including the Dell Mini) cannot use OS managed automatic garbage collection to keep their SSD fresh without suffering serious real-time performance deterioration as a result.


Atom based systems with the Intel US15W chipset are fundamentally incompatible with the TRIM command because the SATA controllers on the board are not really SATA controllers. They are actually just a bridge to an internal PATA controller. SATA "compatibility" on a US15W netbook means only that you can fit a SATA drive into the slot, not that you can benefit from SATA performance. See the Intel Support Community for more information:


"The US15W chipset internally uses a PATA controller. To connect to SATA drives, a bridge chip is used. The drive annouces trim capability when queried by the Windows installer, but the bridge chip does not support passing trim commands to the SATA SSD drive, causing data transfers to the drive to fail."

What typically happens when "data transfers to the drive fail"?


1. Failed Win 7 installation

2. Long boot times and terminal boot hangs

3. Sluggish, frustratingly non-responsive applications

4. Slower than expected read/write speed (~60MB/s) rather than the 220MB/s you were hoping for


If you are experiencing any of these symptoms, you need to disable TRIM in Windows 7. That's right: you need to DISABLE TRIM.


Go ahead and take a moment to feel disappointed, sad and misled. Then run cmd.exe and type in "fsutil behavior set disabledeletenotify 0" at the DOS command prompt. The non-responsive sluggishness will disappear instantly; your computer will be usable once again. Slow read/write speeds however will not be affected. You still will be running a super-fast SATA data through the bottleneck of a PATA controller.

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