Why Hard Disks & Pen Drives have less space than the Promised Space?

Today in this article you're going know about the Storage Space of Pen Drives and Hard Disks. Pen drives and Hard Disks come under the category of USB flash drive which also called USB Drives/Memory Devices etc.. It is a data storage device with an Integrated USB Interface which includes flash memory. Presently, Pen Drives and External Hard Disks have been part of our life just like Smartphone. But have you ever checked that the pen drives storage capacity is different to that of the printed storage space on box or packet by the manufacturer?

Yes, the storage space differs for sure. For example, let us take a 8 GB pen drive and after plugging it to your computer, you can see that only 7.46 GB space is available.

Then where is the rest of 0.54 GB?

A simple math involved in this. Generally, everyone of us knows that computers work using number 2 as the base but Pen Drives and Hard Disks manufacturers consider it as base 10. i.e.:

Virtual Storage	Disk Storage
1 KiloByte (KB) = 1024 Bytes	1 KiloByte (KB) = 1000 Bytes
1 Mega Byte (MB) = 1024 Kilo Bytes (KB)	1 Mega Byte (MB) = 1000 Kilo Bytes (KB)
1 Giga Byte (GB) = 1024 Mega Bytes (MB)	1 Giga Byte (GB) = 1000 Mega Bytes (MB)
8 Giga Byte (GB) = 1024 * 8 = 8192 MB	8 Giga Byte (GB) = 1000 * 8 = 8000 MB

According to the manufacturer "1 GB is equal to 1 Billion Bytes" and the rest of the memory (approximately 0.35 GB) is reserved for data sector and system files for better performance. As the device memory capacity increases, we lose more amount of space. The table below shows some shocking figures (approx.):

Promised Space	Actual Space	Our Loss!
100 GB	93.13 GB	6.87 GB
250 GB	232.83 GB	17.17 GB
500 GB	465.66 GB	34.34 GB
1 TB	931.32 GB	92.68 GB

Manufacturers are actually not cheating anyone. In fact, they mention this on the box of hard disks and pen drives. Take a close look at your hard disk boxes.

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