HGST Travelstar 5K1500 2.5-inch Mobile Hard Drive Review
 

With the new Travelstar 5K1500 2.5’’ drive from HGST we get plenty of storage space and a silent drive which can be used in most notebooks, our gaming PCs for secondary storage purposes or in game consoles if we use to install a lot of content on them.

http://www.madshrimps.be/articles/article/1000488/

The high access times is disappointing, 18.4ms. I was hoping since it was a 9.5mm thick 3 platter drive that it would someone have better access times than a traditional 12mm 3 platter drive, but nope.

Interesting about the dual stage actuator. Western Digital did something like that with the first generation 2TB Caviar Black, which yielded superior access times of about 11.8ms. But in the case of the 5K1500 it didn't seem to help performance at all.
It's good to have 1.5TB though and excited to see if hybrid drives will come out soon with 3 platters at 9.5mm thickness

in real world applications you won't see the difference between the worst and best results of the access times tests if you use the drive as a secondary data storage.
all the files which benefits most from lowest access times (os, apps) should be on an SSD.
larger files (media, games) can happily reside on a spinning platter. A difference of 4ms won't really show itself in a side-by-side comparison when clicking "play" on a music file ;)

Yes that's true. Nobody should use a mechanical drive as a system drive, or at least a hybrid drive with 16GB+ of flash.

This is why I haven't recommended it as a system drive. The ideal setup is one 128GB SSD and this drive with adapter which takes place of the optical drive.

128GB SSD proven to be too small for gamers/enthusiasts
for mom&dad it's sufficient, but anything else.. 256gb minimum please! :)