With FAT32, the wasted space is much less. No matter what file system is used, a boot sector is written to the beginning of each disk, in the first sector. This sector contains the boot program which tells the system what to do when you turn it on. In a high-level format, the operating system creates a structure needed to manage its files and data. In short, it creates a table of contents for the disk.
Most manufacturers sell drives already low-level formatted.
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