noun
disk mirroring
A computing technique where data is written identically to multiple hard disks for redundancy.
サーバーではディスクミラーリングを設定してデータを保護している。
The server uses disk mirroring to protect data.
Variant with interpunct; less common but still seen in technical writing.
RAID is a broader category of disk array configurations; disk mirroring is specifically RAID 1.
Borrowed from English 'disk mirroring'.