My Q-See QT504 went black on all channels. The 1TB hard drive (WD AV-GP) has failed. After watching a video from YT, I ordered this device. When it arrived (2 days) I opened the package, took out the raw drive and put it in my QT504 box. Just 2 plug-ins with SATA drives. Device switched on and it immediately recognized the new HD. Reset all settings and selected format for this disc. After 5 minutes my Q-See QY504 was operational again on all channels! Very happy with it!
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