Asustor Lockerstor 4 (AS6604T) 4-bay NAS Review


I would like to thank Asustor for supplying the review sample.

Asustor recently introduced the Lockerstor 4 NAS, a four-bay NAS with some interesting features. For starters, it uses a capable quad-core Intel Celeron processor for a NAS, with burst frequency of up to 2.7 GHz. Such a server has to strike a balance between power and energy consumption when it comes to the CPU since it operates continuously around the clock. A power-hungry CPU would increase the thermal load, which requires active cooling. Active cooling, on the other hand, is not as reliable as passive cooling and may get noisy. Keeping internal NAS temperatures low is of immense importance for other reasons as well—it ensures less storage-related issues over the long run. While aggressive fan-speed profiles will work, no one wants a noisy NAS at home.

Another interesting feature is the HDMI 2.0a port, which supports up to 4K resolution with a refresh rate of 60 Hz. In combination with the Asustor Portal applications, which include Plex, this NAS can be a powerful multimedia hub. Besides multimedia, there are other scenarios where an HDMI port may come in handy (e.g., surveillance). Below are a few more strong points that speak for the AS6604T.

  • Two 2.5 Gbit Ethernet ports
  • Pair of M.2 NVMe SSD ports (only be usable for cache purposes).
  • Upgradable RAM
  • Dual file-system support for internal storage (btrfs and EXT4)

Finally, if four bays are not enough for your needs some time down the line, you can easily expand your storage by connecting other Asustor NAS units over the bundled USB 3.2 ports.


Asustor Lockerstor 4 (AS6604T) Specifications
Processor Intel Celeron J4125 Quad Core 2.0 GHz (burst frequency of up to 2.7 GHz)
Operating System Embedded Linux
Memory 4 GB SO-DIMM DDR4 (upgradable)
Flash Memory 8 GB eMMC
Storage 4x 3.5″/2.5″ SATA II/III
M.2 Drive Slots (SSD Cache) 2x M.2 PCIe (NVMe) *M.2 2280
RAID Levels: Single Disk, JBOD,
RAID 0, 1, 5, 6, 10
Maximum Drive Bays with Expansion Unit 16
Maximum Internal Capacity (Raw) 72 TB (18 TB HDD x4, real capacity depends on the RAID type)
Maximum Capacity (Raw) with Expansion Units 288 TB (18 TB HDD x16, real capacity depends on the RAID types)
File System (Internal Drives) EXT4, btrfs
File System (External Drives)
  • EXT4
  • EXT3
  • FAT32
  • NTFS
  • HFS+
  • exFAT
  • btrfs
iSCSI Target & Initiator
Hot-Swap 4x
Networking 2.5 Gigabit Ethernet x2 (2.5G/1G/100M)
HDMI Output 1x HDMI 2.0a
Expansion 3x USB 3.2 Gen 1
IP Cameras up to 40 (4x are included)
Dimensions 185.5 (H) x 170 (W) x 230 (D) mm
Weight 2.96 kg
Power Consumption 27.6 W (Operation)
12.6 W (Disk Hibernation)
0.75 W (Sleep Mode)
(with Seagate Ironwolf 16 TB)
Power Supply External, 90 W, 100–240 V (Delta DPS-90AB-3)
Fan 120 mm (FD121225HB)
Warranty 3 years
Price Excluding VAT
(at the time of review)


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