I install DVRs that record and write to the drives constantly 24/7 and we have used Seagate, WD, etc and other than a few versions of Seagate being issues they last for 3-7 years before we replace them, I currently have about 40 in the field right now that I maintain and it is rare that there is a full fledge HDD failure. More often its the PSU or VGA card or just simply corrupted software.
So take this as you will.