I'm a bit confused now, do you have any more information on this?
Many SMART attributes are in a manufacturer-defined format, that makes simple interpretation of raw values problematic when queried by a general-purpose as opposed to manufacturer-specific tool.
For example, the read/seek error rate attributes are some measure of how often an error is occurring as opposed to the cumulative number of errors recorded.
Anyway, can you explain the high hours count value on the Seagate drive?
It may not be hours, it may not even be seconds, it could be an encoded value not meaningful as a decimal number.
From Seagate's support guidance on the topic :
Please remember that these third-party programs do not have proprietary access to Seagate hard disk information, and therefore often provide inconsistent and inaccurate results. SeaTools is more consistent and more accurate and is the standard Seagate uses to determine hard drive failure.
That aside, though, the Seagate Black range is designed as a desktop drive and isn't an optimum choice for an NVR that's handling streaming video data.