What you'll notice
Adding cameras or moving to 4K collapsed your retention; the recorder warns about capacity.
Why it happens
Storage sized for the original system, not the system as it grew.
How we fix it
Retention recalculated for the current camera set; drive upgraded or a second bay populated. Where the recorder is the limit, we say so before you spend on drives.
Still not working?
If the checks above haven't restored your surveillance hard drive, this usually needs a technician. Our CCTV Hard Drive Replacement service covers exactly this fault.