The 500Gb hard drive allows you to use 250Gb for personal storage, this for the majority of Sky customers is plenty as it allows you to record approximately 185 hours of standard definition TV or 60 hours of high definition TV, or obviously a combination of the two.
The remaining 250Gb is reserved by Sky for services such as Sky Anytime, Video on Demand and 3D Services, exactly the same as all current PVR models.
All Sky boxes including this one are now manufactured by Sky, this makes the DRX890w much more reliable than previous models as Sky have far more control over the quality of the components used than ever before. The DRX890w has the lowest return rate due to failure than any other current model.
It's far cheaper than the larger capacity HD box yet it performs just as well (if not better due to reliability), all the functions are the same, you're simply paying for extra storage on the more expensive model, nothing else.
It runs very cool and quiet, much more so than previous models.(Sky4Less.co.uk)