Hello everyone!
I was trying to find the answer to my question on my own but have completely MIXED up 
I’ve installed a security camera system from Lorex with DV7041W DVR. I have a SATA drive from my old COMPUTER and I am interested in whether it can be connected somehow to my system.
I found an adapter that according to its description is able to make an external drive out of internal. People on review sites write that it is easy to connect to a computer or a laptop but I failed to find any information whether it is compatible with DVRs.
There is no information in the DVR manual either.

Here is the instruction manual for my DVR - https://www.lorextechnology.com/downloads/security-dvr/DV700-Series/DV700_SERIES_MANUAL_EN_R1.pdf
and the link to the adapter I wrote about - https://primebuy.com/product/manhattan-179195-usb-1-1-to-sata-ide-adapter-black

Hope you know something about it. Thank you!
I'd open the DVR carefully and inspect what type of hard drive is in it. If the drive in it is a SATA it should accept the drive you want to put into it, however some use 2.5" drives while others use 3.5" drives, and so if you have say a laptop SATA drive that is 2.5" you could put it into the DVR if the bay accepts a 2.5" or 3.5" drive. Just would need to get a 2.5" to 3.5" mounting tray if it accepts normally 3.5" drives.

If the DVR only accepts 2.5" drives and your drive is 3.5" you would have to get a SATA extension CABLE and power extension and mount it external to it. But it would be EASIER to stick to 2.5" drives if thats what it accepts.

The USB to IDE/SATA adapter might not have enough bandwidth to write the video capture data to it on the fly. The internal DVR hardware might be proprietary as well as not have proper drivers for writing the capture to external drives over USB. The file format that the data writes to the drive may also be something proprietary to that DVR and in some instances the data is encrypted to protect the data from tampering.