Disk in DVR for CCTV system is not recognised and gives a contiouous ticking sound

[erlejo]

Disk in DVR not recognised and gives a ticking sound

 

[jojesa]

Disk in DVR not recognised and gives a ticking sound

DVRs use hard drives and just like it could happen in a computer, clicking noises are a sign of a failing hard drive.
You might need to replace the hard drive. Make sure to get a surveillance grade HDD like the this 1TB WD disk
What's your DVR brand and model #?