noun, noun or participle which takes 'suru', transitive verb
unformatting
Computing term for removing formatting from a disk or storage medium, often used as a suru-verb.
そのディスクをアンフォーマットする必要がある。
You need to unformat that disk.
noun which may take the genitive case particle 'no', noun
unformatted
Describes a disk or storage that has not been formatted or has had its formatting removed; used with の to modify nouns.
アンフォーマットのディスクは使えない。
An unformatted disk cannot be used.