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The smallest addressable unit of storage on a disk is called a sector.
If it is a molecular compound, the smallest unit is called a molecule. If it is an ionic compound, the smallest unit is called a formula unit.
The smallest unit of life is known as an atom!
The smallest unit is a quark. I'm not sure what you mean by 'of classification'
Cells.
The smallest addressable unit of storage on a disk is called a sector.
It is called a block (or sector). The size of the block varies depending upon the size of the disk, advanced preferences (the size of files normally being used on that disk), and the filesystem being used. They normally run from 512Bytes to 64KiB. As disk capacity continues to grow, look for even larger block sizes to come :-)
program
It all depends on how your disk is formatted.
A cluster is the smallest unit of disk space that can be allocated to a file
Sector
sector
Sector is the smallest unit on Hard disk identified & addressed by File System.
In digital imaging, a pixel is a single point in a raster image, or the smallest addressable screen element in a display device; it is the smallest unit of picture that can be represented or controlled
In digital imaging, a pixel is a single point in a raster image, or the smallest addressable screen element in a display device; it is the smallest unit of picture that can be represented or controlled
pixel
cluster