Storage: Why we didn't get storage that companies avail ?

Have you ever wondered why you didn't got as much storage as avail by companies?... Has that much part of the storage that is already used is all grasped by your device operating system?...
So, what's about Memory cards?....Let's see why this happens after all, where did that storage goes?...

All the storage companies like Samsung, Kingston, SanDisk, Seagate, etc. works on Decimal Numbers whereas or computer understands Binary Numbers... So, it's a basic fact behind this that why we didn't get that much of storage that much avail by companies..

Computer understands binary which stores information in bits.. Now,

In Decimal,

1 GB = 1000 MB

1 MB = 1000 KB

1 KB = 1000 B

But in Binary,

1 GB = 1024 MB

1 MB = 1024 KB

1 KB = 1024 B

So, let's take an example of 64 GB variant of your smartphone..

as computer stores information in bits so convert all data in bits..

Storage = Decimal Data in bits / Binary Data in Bits

Storage = (64 * 1000 * 1000 * 1000) / (1024 * 1024 * 1024) = 59.60 GB

This is a storage without any deduction of firmware and OS of your phone..

OS would take around 3-7 GB depend on OS company using and firmware around 5-50 KB

So, around 55GB you will get in 64GB variant of your smartphone... Same concept is for other Electronics Devices...

For 1TB Hard Disk,

1TB = 1000 GB (in Decimal)

Storage = (1 * 1000 * 1000 * 1000 * 1000) / (1024 * 1024 * 1024) = 931.32 GB

Out of 1TB = 931.32 will be available only...

There's no OS in SD cards only firmwares are there but there's also a same concept. So, overall all this is due to way in which companies are making storage...

Thanks..