This hard drive is quite big for what it is, just a small laptop hard drive in a case but it is the latest hard drive, and there is not a bigger capacity portable USB powered hard drive out there, so it's in a market size of one really.
This is not formatted for Mac OSX and when it arrived I had to wipe all the security software and all the read me's Western Digital had put on it sadly. This is the only complaint that I have but it's quite a serious one, as I hardly ever use PC, and every time i've used this drive, it's either been on the Xbox or MacBook Pro.
Speed is excellent, I have a USB 3.0 extension cable running into a USB 3.0 bus through the standard SS USB cable supplied. A lot of cables but it still maintains an excellent and very high speed when transferring files such as uncompressed HD clips and large quantities of MP3's. Write speed is excellent too, a full movie MP4 file can be moved in less than 20 seconds over USB 3.0 and about double that on USB 2.0
At around £130-£150 this is quite an expensive hard drive but it's new tech and the largest external drive that's available. There are very few alternatives for this other than a powered portable drive. This requires no plugs other than USB.
The casing is of very good quality but I recommend buying the rock solid case for this. Mine has this clip down hard shell and it never leaves the case because it's incredibly fragile internally. I wouldn't drop test this, put it that way. The plastic is quite hard on this HDD, I can't tell how thick it is but it does seem quite strong, it hasn't dented or cracked in the 4 months i've had it.
There is a white LED which blinks when in use and blinks slightly faster when writing to the drive. It's relatively quiet too, and can only be heard close up, this is about 6 inches away for me and I can just hear a whirr or click now and then.
This hard drive is easy to format or mount through RAID 0 or RAID 1 - this can be done through the devices tab in Disk Utility from the Launchpad on MacBook Pro. This is also where you'll be able to format it for your system. This is a very easy device to format and took me less than 20 minutes to format for Mac, although you may struggle with some FAT formats, especially with such a high storage capacity.
This drive is NOT suitable for xbox 360. While it can be formatted and used for Xbox 360, it does not meet system requirements and is incredibly slow and unreliable for saving games to. I have never had corrupt data when saving on the MacBook but on the Xbox, it's been nothing but a problem child, and you can only utilise 32GB total.
Overall I highly recommend this drive, it's great for backing up and more importantly for me at least, moving files from computer to Xbox.