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SSD as an external USB3.0 oddity?

post #1 of 3
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I bought a 256gb Crucial m4 on sale for my OS drive and put my older Kingston HyperX 3k in an external USB3.0 case.

At first I was having issues with getting my speeds up to USB3.0 speeds (I was stuck at a max of 30MB/s). But I updated updated my USB3.0 drivers and got these.



Pretty nifty for a portable drive. But then I decided to check for TRIM.



According to Crystal Disk Info TRIM appears to be enabled. But TRIM check says otherwise... Any clue what the deal might be?
 
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post #2 of 3
Quote:
Originally Posted by twoofswords View Post

According to Crystal Disk Info TRIM appears to be enabled. But TRIM check says otherwise... Any clue what the deal might be?

Highly doubt the USB to SATA adapter would pass TRIM commands. I think it's safe to assume there's no TRIM support.
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post #3 of 3
Quote:
Originally Posted by twoofswords View Post

I bought a 256gb Crucial m4 on sale for my OS drive and put my older Kingston HyperX 3k in an external USB3.0 case.

At first I was having issues with getting my speeds up to USB3.0 speeds (I was stuck at a max of 30MB/s). But I updated updated my USB3.0 drivers and got these.



Pretty nifty for a portable drive. But then I decided to check for TRIM.



According to Crystal Disk Info TRIM appears to be enabled. But TRIM check says otherwise... Any clue what the deal might be?

Hmm, all I see is three benchmarks for your 256GB Crucial m4, and nothing for a 120GB Kingston SSD.

I put a good old Intel X25-M SATA II SSD in a USB 3.0 portable case, with this result:



The specs for this SSD are 250MB/s sequential read and 80MB/s sequential write. Not a bad result, and beats a HDD on a SATA interface in almost every area. You can see that NCQ is almost completely lost over the USB interface, not a big surprise since USB is a packet interface. Access times are not bad, ~50% slower than on a SATA II interface. A SSD in a portable USB 3.0 case is a nice portable storage device.

No chance that the SATA to USB adapter passes the TRIM command. TRIM enabled in your OS does not mean it is necessarily getting to a SSD, most SATA RAID drivers don't pass TRIM for example.
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