Seagate
I have two Seagate Passport 1-TB drives, and both are small, transportable (I have a box in my RV and at home, 722 to be specific) and neither has failed in two years. I use one for movies, and the other for series such as Breaking Bad, etc. Wish I could back up these little drives, but only way to do it, looking at this forum over time, would be to tsf. the EHD's programs back to the 722, then to a new drive. I await the failure of either drive with great trepidation, since these programs, if lost to drive failure, would only be replaceable in their serial 1,2,3,4 form, by I suppose, buying the DVD series....or hoping/waiting for a "marathon" showing of all episodes, say , of MadMen, such as AMC sometimes will do.
?Sure like having the disk space on the box, though, and so far, any glitches with the Passport are cured by rebooting the 722; it only takes about five minutes.