Asustor Lockerstor 4 Gen 2 (AS6704T) Review

When we reviewed Asustor’s two-bay Lockerstor 2 Gen 2 AS6702T earlier this year, we gave the network-attached storage (NAS) device the no. scored high. The $609 Lockerstor 4 Gen 2 (AS6704T) offers more of the same features, but with four drive bays for increased storage capacity. It’s a solid choice for small business users and home enthusiasts looking for a versatile backup solution, but it doesn’t exactly replace our Editors’ Choice award-winning multi-bay NAS device, the Synology DiskStation DS1522+, which is fast Slightly faster, with five functional drive bays.

Design and Features

The Lockerstor 4’s black cabinet measures 7.3 x 6.6 x 9 inches (HWD) and has four front-access hot-swap drive bays. The drive sled can accommodate 2.5 or 3.5-inch drives, but you’ll need a Phillips screwdriver to attach the drive to the sled using some of the included mounting screws.

There is a small 2.5-inch LCD panel on the front of the cabinet that displays NAS status and IP address. It also provides a menu system for viewing device information, including network settings, storage capacity, and CPU and system temperatures. Here you can also initiate a one-click backup feature when an external drive is connected to the Asustor’s USB port. Four buttons on the right side of the screen (Up, Down, Back, OK) let you navigate the menus. The front panel also has a USB 3.2 Gen 2 Type-A port and LED indicators for power, USB, system and network status.

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(Source: Asustor)

Surrounding the back are two 2.5GbE LAN ports that can be aggregated to create a 5GbE network connection using the Window Server Message Block (SMB) multichannel protocol. There’s also a second Type-A USB 3.2 Gen 2 port, an HDMI 2.0 video output, a reset button, a power port, and a PCI Express expansion slot that can accommodate a 10GbE network card or a PCIe solid-state drive. Lockerstor also has four M.2 slots that can be used to install M.2 NVMe SSDs. A single 120mm fan and vented chassis keep internal components from overheating.

Asustor Lockerstor 4 Gen 2 rear view

(Source: Asustor)

AS6704T is equipped with 2GHz quad-core Intel Celeron N5105 processor, 4GB DDR4 memory expandable to 16GB, and 8GB eMMC flash memory. Like most NAS devices, it comes without drives installed, but each drive can hold up to 22TB for a total capacity of 88TB. If you add two Asustor AS6004U expansion units ($329 each), you get a total of a dozen drive bays for a total capacity of 232TB. (The maximum capacity is 72TB per expansion unit.) The NAS supports single, JBOD, RAID 0, RAID 1, RAID 5, RAID 6, and RAID 10 volume types, as well as EXT4, NTFS, HFS+, Btrfs, and exFAT file systems.

Lockerstor 4 Gen 2 uses the same Asustor Data Master (ADM) operating system as all other Asustor NAS. It is a web-based operating system with a Windows-like desktop and program icons, including Access Control, Activity Monitor, App Central, Backup and Restore, File Explorer, Settings, Dr. Asustor, and Snapshot Center, among others.

In the Access Control menu, you can create users and groups, add shared folders, assign user and group permissions, and create virtual drives. Activity Monitor shows real-time CPU, memory and network activity. You can also view colored pie charts of drive usage statistics. To create and manage storage volumes, scan for bad blocks, and view drive health information, click the Storage Manager icon.

Asustor Data Master OS Control Panel

(Source: Asustor)

From the File Explorer menu, you can browse, manage, and share files, assign folder permissions, and format external drives. Tap the backup and restore icon to enable remote sync and cloud backup, configure one-click backup, create backup plans, and save system settings. The Settings icon allows you to configure fan speed and LED brightness, enable disk hibernation and sleep mode options, enable the ADM Defender antimalware utility, and configure network settings, among other things.

Asustor Data Master OS File Manager

(Source: Asustor)

App Central is your place to access Asustor’s vast catalog of 258 (and counting) branded and third-party apps in categories including home entertainment, backup and recovery, database management, web hosting, blogging, home automation, and more. You can download media server apps like Plex Server, Twonky, and You Tube Music, or use the Spotify app to stream your favorite tunes.

Asustor Data Master OS App Central

(Source: Asustor)

To start a malware detection scan, run system and connection diagnostics, and read recommendations to keep your NAS safe and healthy, click the Dr. Asustor icon. Finally, if you use the Btrfs file system, Snapshot Center is where you manage and restore instant backups.

Asustor Data Master OS Diagnostics

(Source: Asustor)

Installation and Performance

Setting up the AS6704T for first-time use is very simple. I installed four 10TB Seagate IronWolf drives, connected the NAS to my router, and booted it up.I opened a web browser on my desktop computer, also connected to my router, and typed In the address bar, download the Asustor Control Center software for Windows.

After installing the software on my PC, I ran it and the NAS was recognized immediately. I click the Uninitialized button next to the device name to boot the ADM OS, update the software, and wait a few minutes for the NAS to reboot. Next, I selected 1-Click Setup (you can manually configure the NAS if you want), created an account, entered my storage preferences (balanced, maximum capacity, advanced data protection), and selected Btrfs as my file system.

I chose a balanced storage system that defaults to RAID 5 with a total storage capacity of 27.28TB. I pressed Initialize, and within a few minutes, the device was initialized. After another 14 hours, the drives were synchronized and ready for testing.

The Lockerstor 4 achieved high scores in our file transfer test, where we achieved read and write speeds when transferring a 4.9GB folder containing music, videos, Photos and office documents are on the same network.

The device’s score of 87MBps on the write test was higher than the ioSafe 1520+ (85MBps) and the TerraMaster F5-422 (80MBps), but slightly lower than the Synology DS1522+ (90MBps). In our read test, the AS6704T was 2MBps slower than its competitors.

Verdict: This 4-Bay NAS Will Satisfy You

The Asustor Lockerstor 4 Gen 2 (AS6704T) is a versatile network-attached storage appliance that offers four hot-swappable bays and plenty of room for upgrades and expansion. The NAS turned in fast scores on our file-transfer tests, and comes with a wealth of applications, as well as one-to-many Gigabit LAN ports. HDMI video output and a powerful quad-core processor make it a solid choice for transcoding and streaming 4K video, as well as backing up critical data. Our favorite multi-bay Synology DiskStation DS1522+ has a fifth drive bay, more connection options, and a touch faster, but it doesn’t offer nearly as many applications as the Lockerstor.

Asustor Lockerstor 4 Gen 2 (AS6704T)

the bottom line

Asustor’s Lockerstor 4 Gen 2 is a powerful but pricey four-bay NAS packed with features and top-of-the-line components.

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