My hard drive capacity appears smaller on TNAS?

Hard Drive, volume, storage pool, RAID
Post Reply
User avatar
TMroy
TerraMaster Team
Posts: 2578
Joined: 10 Mar 2020, 14:04
China

My hard drive capacity appears smaller on TNAS?

Post by TMroy »

My hard drive capacity appears smaller on TNAS?

The hard drive capacity appears smaller than that claimed by the HDD manufacturer that is a very common situation because of a different definition of the storage unit. The TNAS file systems adopt the binary definition of storage units while HDD manufacturers adopt the decimal definition.

Decimal definition adopted by HDD manufacturers:
1 TB = 1000 GB; 1 GB = 1000 MB; 1 MB = 1000 KB; 1 KB=1000 Bytes

Binary definition adopted by file systems:
1 TB = 1024 GB; 1 GB = 1024 MB; 1 MB = 1024 KB; 1 KB=1024 Bytes

For example, if you buy a hard drive labeled as 8 TB in capacity, and install it on your TNAS, the actual size displayed will be as follow:
8 x 1000,000,000 Bytes / (1024 x 1024 x1024) = 7.448 TB
To contact our team, please send email to following addresses, remember to replace (at) with @:
Support team: support(at)terra-master.com (for technical support only)
Service team: service(at)terra-master.com (for purchasing, return, replacement, RMA service)
Post Reply