The smallest unit of space on a hard drive is a "bit". Eight bits make a byte, which is the basic unit. Half a byte is (appropriately) called a "nibble". One thousand and twenty-four bytes make up a kilobyte, 1024 kilobytes make up a megabyte, 1024MB equals a gigabyte, and 1024GB equals one terabyte. We can't go much higher than a terabyte right now, but we may make larger hard drives in the future.
cluster
The smallest unit of space on a hard drive that can be used to store a file is called a "sector." A sector typically holds 512 bytes of data, although newer hard drives may have larger sector sizes. Multiple sectors are grouped together to form clusters, which are used to store files on the hard drive.
The smallest storage access unit on an IDE hard drive is a sector.
The smallest unit of space allocated to a file is a cluster or block, which is a contiguous group of sectors on a hard drive allocated to a single file. The size of a cluster can vary depending on the file system and the size of the disk.
Maybe you should check your book. <---- not very nice A Cluster
SECTOR!
bytes
Minutes is a unit of time GB is a unit of space on a hard drive
It all depends on how your disk is formatted.
Sector
Cell
Hard Drive Disk (HDD)