UniFi - HDD Requirements and Compatibility

UniFi - HDD Requirements and Compatibility

HDDs are not required for normal operation, however they expand the functionality by enabling things such as video recording from UniFi Protect, and call recordings and voicemails from UniFi Talk.

We strongly recommend using the WD Sureveillance HDD for UniFi OS Consoles with a 3.5” HDD bay such as our Dream Machine (UDM-Pro / UDM-Pro-SE), and Network Video Recorders (UNVR / UNVR-Pro).

Cloud Keys (UCK-G2-PLUS) require a 2.5” HDD for which we strongly recommend continuing to use the drive shipped natively with your equipment. If it will be replaced, the Toshiba 2.5" 5400RPM 1TB HDD (MQ01ABD100V) appears most stable according to internal testing.

Third-party Drives

If you insist on using a third-party drive, it should meet the following criteria:

  • It fits inside the HDD tray
    • 3.5” for Dream Machines and Network Video Recorders
    • 2.5” for the UCK Gen2 Plus
  • It is a surveillance-grade drive designed for continuous load
    • These are generally 7200RPM, CMR Drives. SMR drives are not recommended and may lead to performance issues, loss of video footage, or even system crashes.
  • It offers at least 1 TB of storage.  No maximum HDD capacity has been established.

If you're using multiple HDDs with your UniFi OS Console, they must all be the same size.  

The total usable storage capacity will be affected based on whether either the redundancy level is set to One Disk (RAID1 / RAID5) or Half of Disks (RAID10). 

Incompatible HDDs

Some hard drives require an additional 12V external power supply. These hard drives are not supported by the UCK Gen2 Plus or the UNVR.

The following is a list of 3.5” drives that are confirmed to be incompatible with our UniFi OS Consoles:

Vendor Series Model Capacity Notes


SkyHawk ST10000VX0004 10TB Does not fit the drive tray.


Ultrathin ST500LT032 500GB Does not have bottom screws.
Western Digital UltraSlim WD5000MPCK 500GB Does not have bottom screws and connectors do not fit the tray.


Any SMR Drives Any Drives fit the tray but cause issues.

If you have questions about a particular hard drive or need help choosing a hard drive, please reach out to the Ubiquiti Community for insights and recommendations.