Both Megabyte (MB) and Mebibyte (MiB) are units of information or computer storage. But MB is used in two ways either as equivalent to 1000 Kb or 1024 Kb. This creates some sort of confusion. To avoid this, the International Electrotechnical Commission (IEC) (1998), the leading international organization for worldwide standardization in electrotechnology, approved as an IEC International Standard names and symbols for prefixes for binary multiples for use in the fields of data processing and data transmission. They recommended the use of Mebibyte (a combination of Mega and Binary) MiB, which always refer to 1024 Kb. See the table for percentage difference in storage size in MB and MiB. The difference is significant as the storage size increases. 
Differences between Megabyte and Mebibyte (MB vs MiB)
Megabyte vs Mebibyte
Megabyte is a multiple of 1000
Mebibyte is a multiple of 1024
The unit symbol for the megabyte is MB
The unit symbol for the mebibyte is MiB
Megabyte is estimated as 10^6 or 1,000,000 bytes
Mebibyte is exactly 1,048,576 bytes.
The decimal prefix Mega means 1000 x 1000 bytes=100000 bytes
The binary prefix Mebi means 220=bytes=1024 x 1024 bytes=1048576 bytes
1 MB=1000*1000 bytes= 1000000 bytes or 1000Kb
1 MiB=1024*1024 bytes= 1048576 bytes or 1048.576 Kb
Technically, Megabyte is a power of 10
Mebibyte is always a power of 2
Sometime1 MB refers to both 1000 Kb or 1024 Kb
1 MiB is always 1024 Kb
Disk manufactures commonly use decimal prefix or MB
Memory manufactures commonly use binary prefix or MiB.
Storage devices such as HDDs and Flash drives, still uses MB (1000Kb) for calculating storage size
Most operating systems Ubuntu and Windows use mebibytes to report file and storage sizes. For Example, 500 GB drive is reported by the OS as "465.66 GB" (meaning 465.66 GiB).


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  1. What is a Magabyte? (you wrote "Technically, Magabyte is a power of 10")

    1. It's Trump's new storage value. 1 Magabyte can store a YUGE amount of data.


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