The A-DATA PD7 4GB USB drive landed up in our test labs; we expected it to perform well, based on our experience with the last A-DATA USB drive we tested (a 512 MB). The drive is pretty compact; it has a brushed metal look to it. It is made of plastic, but is still pretty solid. LEDs are placed towards the rear that shows any drive activity. The LED region has a small bridge where you can attach a strap.We're not sure if it's strong enough though. The cap has some smooth sliding mechanism but it seems pretty loose and looks like it'll fall off after some use.

Performance: it's good! It impressed us throughout all the tests we ran on it. Read speeds for 50 MB of data a single file or separate files hovered around the lovely 2-
second mark. Write speeds for files of the same size were a fraction more. We then copied the maximum amount of data that we could on the drive, which is 3.86 GB. A single file took 3:19 minutes to write; reading took 2:07 minutes. Writing assorted files of 3.86GB took around 5:01minutes and reading the same size took 2:2 minutes. In HD Tach, the average data read speed was recorded at 32.2MB/s and the average write speeds at 21.8MB/s . Random access times were a miniscule 0.8ms which was similar some of the best USB drives we've seen. HD Tach also reported the CPU Utilization was 0%.

The drive happens to have security features built into it, but only after you install their software which isn't provided with the drive. You can download it for free, though, from A-DATA's site. The program lets you create a partition that can be accessed by using the software and a password. The package mentioned a USB extension cable, but we found none. The software and the manual could have been provided along with the drive. There's a label that says it's enhanced for Windows ReadyBoost, which suggests it would go well with Vista and it has the good performance to defend that. At $70, it is a bit costlier than most drives in its range, but definitely worth the money if you value speed.

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specifications:-
Size: 66 x 19 x 10 mm;
weight: 15 gm; USB 2.0 and 1.1 compliant.