Expansion units

When the bays run out, an expansion unit adds more without migrating a byte. DX units pair with DiskStation, RX and RXD with RackStation, FX with FlashStation. Each page lists the compatible hosts.

Popular

DX525

Synology DX525 5-bay expansion unit

Seamless capacity expansion for Synology DiskStation

$1,021.00inc. GSTIn stock

DX517

Synology DX517 5-bay expansion unit

Effortless capacity expansion for Synology DiskStation solutions on-the-fly.

$1,021.00inc. GSTIn stock

DX1222

Synology DX1222 12-bay expansion unit

Easily double or triple the storage capacity of your Synology DiskStation.

$2,589.00inc. GSTOnly 1 left

DX1215II

Synology DX1215II 12-bay expansion unit

Plug-and-play storage expansion for Synology DiskStation

$2,589.00inc. GSTOnly 1 left

RX1217

Synology RX1217 12-bay expansion unit

Scale up your RackStation in a breeze

$3,291.00inc. GSTOnly 2 left

RX1223RP

Synology RX1223RP 12-bay expansion unit

Reliable storage expansion with redundant power

$4,999.00inc. GSTOnly 2 left

RX1217RP

Synology RX1217RP 12-bay expansion unit

Scale up your RackStation in a breeze

$4,999.00inc. GSTOnly 2 left

Add bays without migrating

An expansion unit connects over eSATA or Infiniband and appears as extra bays in DSM. You can extend an existing storage pool across it or keep it as a separate pool for backups. DX517 and DX525 pair with DiskStation Plus models, RX418, RX426 and RX1223RP with RackStation, RXD1219sas and RX1222sas with the SA series, FX2421 with FlashStation. Each listing names the hosts it supports.