​How to select the allocation unit size when the USB drive is formatted

- Jun 28, 2018-

When we will own USB drive formatting, format the interface parameter is set, one of the allocation unit size Settings, many friends don't know what is the meaning of allocation unit size and also don't know how to choose, so small make up today is to introduce the allocation unit size, and teach you how to choose a suitable allocation unit size.

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Allocation unit size refers to the minimum unit of system read and write to disk or mobile storage device. When we format our own USB drive and set the allocation unit size, the file is split into sections to be stored on disk based on the set value. Normally, the smaller the value assigned to the cell size, the more space is saved, but it takes longer to read. Conversely, larger values waste more space, but take less time to read.

This passage above, we may think it's too general, and then give you an example: a file size is 400 bytes, if we set the allocation unit into 512 bytes, this file will occupy 512 bytes of storage space; When we set the allocation unit to 1024 bytes, the file takes up 1024 bytes of space. So the smaller the allocation unit, the more space is saved, but it's slow to read because when the allocation unit is small, a file is allocated a few blocks to store in each cell.

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When USB drive formatting will default allocation unit size, we can not do change, but for some special requirements of users, can according to the size of the storage file to set the corresponding allocation unit size.