Unchecking “Quick Format” makes Windows check the disk sector-by-sector with a low-level format that takes much longer, but it will also wipe all traces of any old data completely. The data is still on the drive but all references to it are lost, so it will be overwritten as you use the newly formatted drive.
Depending on the drive’s size, your options will be FAT, FAT32, NTFS, or exFAT. File System: A file system is a data structure that tells an operating system how to save and load files to or from a disk.Formatting takes up some of the raw disk space because of how file systems work.
Capacity: This will be the data capacity of your hard drive or SSD once it is formatted.