[SOLVED] Why TB Hard Driver's shows less than original size?

[madican]

I bought 2 hard drivers 3 and 4 TB. In system 3TB HD shows 2.72GB and 4TB HD shows 3.63GB i dont understand where is other size? It is isn't scamm?...

 

[SkyNetRising]

Simple math.
4TB drive capacity is actually 4'000'000'000'000 bytes (not 4TB).
Same thing for 3TB drive - it's 3'000'000'000'000 bytes instead.

4'000'000'000'000 bytes/1024/1024/1024/1024 = 3.6379GB
3'000'000'000'000 bytes/1024/1024/1024/1024 = 2.7284GB

 

[alceryes]

Hard drive manufacturers market drives in terms of decimal (base 10) capacity. In decimal notation, one megabyte (MB) is equal to 1,000,000 bytes, one gigabyte (GB) is equal to 1,000,000,000 bytes, and one terabyte (TB) is equal to 1,000,000,000,000 bytes.

Operating systems, firmwares, and programs use the binary (base 2) numbering system. In the binary numbering system, one megabyte is equal to 1,048,576 bytes, one gigabyte is equal to 1,073,741,824 bytes, and one terabyte is equal to 1,099,511,627,776 bytes.

The difference you are seeing is the difference in these two methods for calculating the amount of storage space on drives.

 

[RolandJS]

Don't forget to consider the OS housekeeping, i.e., setup of what I used to know as FAT (showing my age!), track placement, and so on. That stuff normally does not get counted when one does byte-space searching.

 

[madican]

Simple math.
4TB drive capacity is actually 4'000'000'000'000 bytes (not 4TB).
Same thing for 3TB drive - it's 3'000'000'000'000 bytes instead.

4'000'000'000'000 bytes/1024/1024/1024/1024 = 3.6379GB
3'000'000'000'000 bytes/1024/1024/1024/1024 = 2.7284GB

Hmm,that's interesting.

 

[madican]

Hard drive manufacturers market drives in terms of decimal (base 10) capacity. In decimal notation, one megabyte (MB) is equal to 1,000,000 bytes, one gigabyte (GB) is equal to 1,000,000,000 bytes, and one terabyte (TB) is equal to 1,000,000,000,000 bytes.

Operating systems, firmwares, and programs use the binary (base 2) numbering system. In the binary numbering system, one megabyte is equal to 1,048,576 bytes, one gigabyte is equal to 1,073,741,824 bytes, and one terabyte is equal to 1,099,511,627,776 bytes.

The difference you are seeing is the difference in these two methods for calculating the amount of storage space on drives.

Understood thanks for the information!

 

[VOIDEV]

please set this discussion to solved so credit can go where credit is due.