I wonder if someone might help me with a query.
I have a Vistron "AHD.DVR-4V" CCTV system which is set to record and review over a 30 day period.
The unit contains a hard drive which I suspect is way bigger, in capacity, than is required to record just 30 days.
At the end of each 30 days, the unit starts counting the next thirty days - meaning that the Menu only allows me to review each past 30 day period.
I am wondering if means it automatically over-writes the earlier recordings or simply only make the past thirty days available through the menu, yet write to different area(s) of the hard drive, which would make it technically possible to recover the older recordings through interrogating the drive via either and/or a PC or Mac.
Has anyone any experience of retrieving old data, in this manner, who would be willing to advise please?
If it is possible, would I need any propriety software?
I have made enquiries of the manufacturer (based in Singapore) but suspect the unit may actually be a generic model being marketed under a variety of guises and the "manufacturer" seems disinclined to even acknowledge my email enquiries of them.