If you reformat a document, you change the way it is set out on the page, not the words themselves: the space between lines, the size of the letters, the margins, whether the text sits in columns. Office workers and students say this when they tidy a file before printing or sending it. Though actually, the same verb has a sharper life with computers. If you reformat a disk, a USB drive, or a phone’s storage, you wipe the old filing system and lay down a new one, and the files that were there are usually gone. That is a much bigger act than changing the look of a school report. The feeling of the word is practical and a little technical; in everyday talk people often just say “change the layout” unless they mean the disk.

重新格式化（文件＝重排版面；硬碟／隨身碟＝整個重設，資料通常會沒）