HDD/SSD Real Capacity Calculator (하드디스크/SSD 실제 용량 계산기)

Input
Manufacturer standard (Decimal): 1 GB = 1,000,000,000 bytes
Auto-calc
Displayed as GB/TB, but calculated in binary units (GiB/TiB).
Result
Advertised Capacity
64 GB
Actual Usable Capacity
59.6 GB
Actual/Advertised Ratio
93.1%
Byte-level Details
-
Why is the actual capacity lower?

Manufacturers use decimal (1KB=1000B), while OS use binary (1KiB=1024B) for calculation.

Decimal (Manufacturer)
1 KB = 1,000 B
1 MB = 1,000 KB
1 GB = 1,000 MB
1 TB = 1,000 GB
Binary (Operating System)
1 KiB = 1,024 B
1 MiB = 1,024 KiB
1 GiB = 1,024 MiB
1 TiB = 1,024 GiB