File size is a measure of how much data a computer file contains or, alternately, how much storage it consumes. Typically, file size is expressed in units of measurement based on the byte. By convention, file size units use either a metric prefix (as in megabyte and gigabyte) or a binary prefix (as in mebibyte and gibibyte). 
When a file is written to a file system, which is the case in most modern devices, it may consume slightly more disk space than the file requires. This is because the file system rounds the size up to include any unused space left over in the last disk sector used by the file. (A sector is the smallest amount of space addressable by the file system. The size of a disk sectors is several hundred or several thousands bytes.) The wasted space is called slack space or internal fragmentation.  Although smaller sector sizes allow for denser use of disk space, they decrease the operational efficiency of the file system.
The maximum file size a file system supports depends not only on the capacity of the file system, but also on the number of bits reserved for the storage of file size information. The maximum file size in the FAT32 file system, for example, is 4,294,967,295 bytes, which is one byte less than four gibibytes. 
|Traditional units||Decimal for comparison|
|Name||IEC||Binary||Number of bytes||Equal to||Name||IEC||Decimal||Number of bits||Equal to|
|Kibibyte||KiB||2 10||1,024||1024 B||Kilobit||kbit||10 3||1,000||1000 bit|
|Mebibyte||MiB||2 20||1,048,576||1024 KiB||Megabit||Mbit||10 6||1,000,000||1000 kbit|
|Gibibyte||GiB||2 30||1,073,741,824||1024 MiB||Gigabit||Gbit||10 9||1,000,000,000||1000 Mbit|
|Tebibyte||TiB||2 40||1,099,511,627,776||1024 GiB||Terabit||Tbit||10 12||1,000,000,000,000||1000 Gbit|
|Pebibyte||PiB||2 50||1,125,899,906,842,624||1024 TiB||Petabit||Pbit||10 15||1,000,000,000,000,000||1000 Tbit|
|Exbibyte||EiB||2 60||1,152,921,504,606,846,976||1024 PiB||Exabit||Ebit||10 18||1,000,000,000,000,000,000||1000 Pbit|
|Zebibyte||ZiB||2 70||1,180,591,620,717,411,303,424||1024 EiB||Zettabit||Zbit||10 21||1,000,000,000,000,000,000,000||1000 Ebit|
|Yobibyte||YiB||2 80||1,208,925,819,614,629,174,706,176||1024 ZiB||Yottabit||Ybit||10 24||1,000,000,000,000,000,000,000,000||1000 Zbit|
Kilobyte (KB) (JEDEC), is sometimes referred to unambiguously as kibibyte (KiB)(IEC). Sometimes kB, with lower cased SI-prefix k- for kilo (1000), is used, then always equaling 1000 bytes.
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How to Render Video With High Quality and Low File Size in After Effects
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Once you complete a project in Adobe After Effects, you can use the «Render Queue» to make transfers of the files. Even if you do not have a project in After Effects, you can convert and downsize video or audio clips with the options available in the software. A few setting adjustments will give you smaller sized files
Add the file or project you want to convert to the «Layers» window as its own composition. If it is a complete project, just go to «File» and «Open Project» to select it.
Click on «Composition» and select «Add to Adobe Media Encoder Queue.» A new window will appear (If you already installed Adobe Media Encoder) and project file will be automatically added to the Media Encoder Queue.
Click on the project and set «Output File.» Select custom and a new window will pop up then save it.
Click on «Start Queue» and it will start the conversion process.
Reduce Render File Size in After Effects
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Англо-русский толковый словарь терминов и сокращений по ВТ, Интернету и программированию. . 1998-2007 .
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