2. Power on the expansion units.
3. Verify that the expansion units are recognized by the NAS.
a. Log on to QTS as administrator.
b. Go to Main Menu > Storage & Snapshots > Overview > System .
c. Verify that the expansion units are listed.
Rail Kits
The TS-855eU is compatible with the following model:
• RAIL-B02
Rail kits are not included with the NAS and must be purchased separately. For details, contact an authorized
reseller or go to
You can find installation information in the rail kit package.
QTS installation
The TS-855eU uses the QNAP QTS operating system. You can install QTS using any of the following methods.
You can also install the QNAP QuTS hero operating system. If your NAS is connected to the internet, the
option to install QuTS hero will appear in the Smart Installation Guide wizard using any of the methods in
the table. You can also manually download the QuTS hero firmware from
TS-855eU User Guide
Installation and Configuration
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