SATA drive in USB3.0 Enclosure

pooch said:

meddylad said:

Im using AS SSD to run benchmarks but im gettin a strange result on my external usb3 drive. The sequential starts off at 30mb/s but then slowly drops to 1.4mb/s and stays at this speed - i cant see why it would be doing this.

Aslo, considering im using usb3 with all the correct componets, i thought i would be getting more than 30mb/s, considering the drive is a 7200rpm with 16mb cache

Out of curiosity, would the actual adapter circuit board (where the sata connects to the usb) be slowing it down or is that irrelevent

Have you got more hardware details??

Im using a 2.5" Momentus 7200.3 notebook drive - 500gb, 7200rpm, 16mb cache. Its connected via a usb3 cable to a usb3 drive with renesas usb3 driver loaded. Im shocked that the drive is so slow - in usb2 i get 19mb/s sequential but usb3 only gives me 30mb/s....but then it slows down to a crawl 1mb/s - i have updated the driver as this sriver is the second one released by Dell but thought that i should get up in the 50-60mb/s - i say this because the iomega has a usb3 external drive out that can reach up to 10 times faster - even though the drive inside is a 5400rpm

The HDD is in an enclosure and the adapter is usb3 compliant - the enclosure i bought was this one below

2.5" SATA USB 3.0 2.0 HDD Enclosure Case Caddy Windows7 | eBay UK

You basically insert your hdd and its converted to usb3. I know 100% that my usb3 driver is loaded and the correct version, and i know that the system definitely has usb3 ports (2 of them, 1 usb2 and an esata)

Tested with ATTO - the results are below

ps do these speeds look normal - they ceetainly are not "10x faster than usb2.0" as advertised

Here is the same test but via usb2 - im so shocked as to how slow the speeds are, and although the usb3 speeds are a little faster, they are quite pathetic considering they are supossed to offer more speed. I mean, there are some compact flash cards that are faster here than my usb3.0 drive