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ASUSTOR AS6512RD

ASUSTOR Lockerstor 12RD AS6512RD twelve-bay 2U NAS photographed from the front right, showing the lid, drive trays and rack ears.

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AS6512RD 12-bay 2U rackmount NAS, diskless

Processor:
Intel Atom C3538, quad-core, 2.1 GHz, x64 64-bit
Memory:
8 GB SO-DIMM DDR4 (8GB x1 pre-installed); 4 slots, expandable to 128 GB (4 x 32 GB), mixed capacities supported
Flash memory:
8 GB eMMC

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Package details

Model: AS6512RD

12-bay 2U rack NAS with an Intel Atom C3538, 8 GB DDR4, two 2.5GbE plus two 1GbE ports and dual redundant 350W power supplies. Drives are not included.

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing
Included essentials:
AS6512RD unit, quick installation guide, 2x AC power cords, 2x RJ-45 Cat 5e LAN cables, screws for 3.5" and 2.5" drives

Important limit: 2U and 535 mm deep: needs a proper server rack or a very deep closet shelf, and the rear rails must clear the cabling

How many units?

Confirm condition, quantity and included accessories on the retailer’s listing.

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Specifications checked November 3, 2026. Full product details

A NAS. Then the drives.

Your files, your hardwareLook inside the box

What will your NAS do?

Choose the job first. Then check drives and the network.

NAS job

Choose a job to reveal the hardware trade-off.

ASUSTOR AS6512RD: 12 SATA bays, empty in the diskless enclosure.ENCLOSURE / SATA DRIVE PLANEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBayEmptyBay12 SATA bays · drives are purchased separately
SATA bay diagram · schematic, not physical scale

Empty bays do not store files. The enclosure and the drives are separate purchases. Check the maker’s drive and firmware compatibility list.

Selected enclosureKnow what is included

ASUSTOR AS6512RD

Intel Atom C3538

✓ NAS enclosureDrives sold separately
SATA bays
12
Installed RAM
8 GB
Fastest Ethernet
2.5 Gbps

Choose the job

The enclosure is only the beginning.

Look at the drive bays, then check the software and network your job needs.

The trap to avoid

Bay count does not tell you whether any drives are included. Match the exact enclosure or bundle.

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Source specs & exact version

ASUSTOR Lockerstor 12RD (AS6512RD) 12-Bay Rackmount NAS

AS6512RD 12-bay 2U rackmount NAS, diskless

Recorded model: AS6512RD

Specifications checked 2026-11-03.

Processor
Intel Atom C3538, quad-core, 2.1 GHz, x64 64-bit
Memory
8 GB SO-DIMM DDR4 (8GB x1 pre-installed); 4 slots, expandable to 128 GB (4 x 32 GB), mixed capacities supported
Flash memory
8 GB eMMC
Drive bays
12x 3.5"/2.5" SATA HDD/SSD (SATA3 6Gb/s); hot swappable
Maximum internal raw capacity
216 TB (12 x 18 TB HDD; capacity may vary by RAID type)
Network
2x 2.5 Gigabit Ethernet (2.5G/1G/100M) and 2x Gigabit Ethernet (1G/100M); the two 2.5GbE ports aggregate to up to 5 Gbps
Network protocols
CIFS/SMB, SMB 2.0/3.0, AFP, NFS, FTP, TFTP, WebDAV, Rsync, SSH, SFTP, iSCSI/IP-SAN, HTTP, HTTPS, Proxy, SNMP, Syslog; 802.3ad link aggregation with six other modes

Raw capacity is before RAID and formatting. The example does not establish drive compatibility.

Drive planning and software explained →

Photo credit: manufacturer image source ↗

Specifications explain hardware limits. No performance tests are claimed.

In the box

In the box

AS6512RD unit, quick installation guide, 2x AC power cords, 2x RJ-45 Cat 5e LAN cables, screws for 3.5" and 2.5" drives

Manufacturer specifications

ASUSTOR Lockerstor 12RD (AS6512RD) 12-Bay Rackmount NAS

A 2U rackmount NAS with twelve SATA bays, an Intel Atom C3538, 8 GB DDR4 (expandable to 128 GB), two 2.5GbE and two 1GbE ports, a PCIe slot for a 10GbE card and redundant 350W power supplies.

Which version should you buy?

Selected package: AS6512RD 12-bay 2U rackmount NAS, diskless.

Selected package

  • Lockerstor 12RD (AS6512RD) diskless rackmount NAS

    This page

    Model: AS6512RD

    What differs
    12-bay 2U rack NAS with an Intel Atom C3538, 8 GB DDR4, two 2.5GbE plus two 1GbE ports and dual redundant 350W power supplies. Drives are not included.
    Best for
    Home or small-office rack owners who want twelve bays and redundant power.
    Check price on Amazon

Related models and generations

These are different products. Check their specifications separately.

  • Lockerstor 4RD (AS6504RD) rackmount NAS Model: AS6504RD

    4-bay 1U sibling with the same Atom C3538 CPU, 8 GB DDR4 and a PCIe slot, but two Gigabit Ethernet ports (no 2.5GbE) and 250W x2 power supplies.

  • Lockerstor 4RS (AS6504RS) rackmount NAS Model: AS6504RS

    Same 4-bay 1U chassis and Gigabit Ethernet as the 4RD, with a single 250W power supply (not redundant).

  • Lockerstor 12R Pro Gen2 (AS7212RDX) Model: AS7212RDX

    Current-generation 12-bay 2U model with newer hardware; ASUSTOR lists it under Small & Medium Business rackmount storage.

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • AS6512RD is a 2U twelve-bay rack model; the similarly named AS6504RD/4RS are 4-bay 1U units with different network ports.
  • A 10GbE card in the PCIe slot is a separate purchase; the base box's fastest built-in port is 2.5GbE.

Why people pick it

  • Twelve hot-swap SATA bays in a 2U chassis (216 TB internal raw capacity, up to 28 bays with an expansion unit)
  • Four Ethernet ports: two 2.5GbE plus two 1GbE, with link aggregation up to 5 Gbps
  • PCIe 3.0 slot lets you add a 10GbE card instead of replacing the NAS
  • Memory scales from 8 GB to 128 GB across four SO-DIMM slots
  • Redundant 350W power supplies keep the box up if one PSU fails

Know before you buy

  • 2U and 535 mm deep: needs a proper server rack or a very deep closet shelf, and the rear rails must clear the cabling
  • No 10GbE port on the base unit; the PCIe slot must be filled with a separately purchased card
  • Multimedia output is listed as N/A (no HDMI)
  • Atom C3538 is a 2.1 GHz server chip, not a high-clock media-transcoding CPU

Full specifications

ProcessorIntel Atom C3538, quad-core, 2.1 GHz, x64 64-bit
Memory8 GB SO-DIMM DDR4 (8GB x1 pre-installed); 4 slots, expandable to 128 GB (4 x 32 GB), mixed capacities supported
Flash memory8 GB eMMC
Drive bays12x 3.5"/2.5" SATA HDD/SSD (SATA3 6Gb/s); hot swappable
Maximum internal raw capacity216 TB (12 x 18 TB HDD; capacity may vary by RAID type)
Expansion baysUp to 28 drive bays with an expansion unit (480 TB raw with expansion units, 24 x 20 TB HDD)
Network2x 2.5 Gigabit Ethernet (2.5G/1G/100M) and 2x Gigabit Ethernet (1G/100M); the two 2.5GbE ports aggregate to up to 5 Gbps
USB4x USB 3.2 Gen 1
PCIe expansionPCIe 3.0 x8 slot (black, x4 link); accepts a separately purchased 10GbE card
Rack form factor2U rackmount, 88(H) x 439(W) x 535(D) mm, 11.7 kg; front-panel "Find Me" button lights the rear service LED
Power supply2x 350W internal, redundant; 100V to 240V AC input
Power consumption115W (operation), 67W (disk hibernation)
Cooling2x 60mm system fans
RAID supportSingle, JBOD, RAID 0, 1, 5, 6 and 10
File systemsInternal: EXT4, Btrfs; external: FAT32, NTFS, EXT3, EXT4, HFS+, exFAT, Btrfs
Operating systemASUSTor ADM 5.1.4.RM62 (current version on the download center)
Network protocolsCIFS/SMB, SMB 2.0/3.0, AFP, NFS, FTP, TFTP, WebDAV, Rsync, SSH, SFTP, iSCSI/IP-SAN, HTTP, HTTPS, Proxy, SNMP, Syslog; 802.3ad link aggregation with six other modes
Client OS supportWindows 10, 11, Server 2016, Server 2019, Server 2022; macOS; UNIX, Linux and BSD
Access limits4096 users, 512 groups, 512 shared folders, 512 concurrent connections; Windows Active Directory and LDAP
In the boxAS6512RD unit, quick installation guide, 2x AC power cords, 2x RJ-45 Cat 5e LAN cables, screws for 3.5" and 2.5" drives
Maker throughput figuresASUSTOR's chart: 295 MB/s read and write over a single 2.5GbE port; 591 MB/s read with the two 2.5GbE ports aggregated
Warranty3 years

From manufacturer documentation, checked November 3, 2026. Spotted an error? Tell us.

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