Costco Surveillance DVR Replacing HDD with 4TB

Costco sells a video surveillance DVR from Lorex with a 1TB disk drive. It is relatively easy to replace that drive with a 4TB drive.
There are drives available for that are configured specifically for surveillance systems. I don't know which brand is good and which is bad. My replacement drive has a 3 year warranty, and i guess we will find out, if it makes it or not.
I had to replace mine, because I thought it was broken. After installing the new drive, it still didn't work. Checking out the power supply: Bummer! It could only deliver 6 Volts, and it needs 12V.
Somehow the power supply broke.
With a new power supply, i am up and running again with a much larger drive.