My hard drive capacity appears smaller on TNAS?
Posted: 25 Dec 2021, 12:04
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
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