Ws-uec220ds is a usb2.0 to e-sata array hard disk enclosure, supports raid 1. Raid 1is also called mirror or mirroringwhich ensures user of reliability and restore of data to maximum extent. Every writing to disk will automatically backed up 100% to separate disk in raid 1 . as figure abovesystem will read data in original source disk in raid 0and will not read data in back up disk, if fails to read data in original disksystem will automatically change and read data in back up diskthis will not interrupt operation task for user. Of coursewe must replace the failed disk immediately and creat mirror with back up datato avoid data loss you cant afford if a back disk fails. as storage data is backed up 100% in raid 1, so raid 1 provide the highest level protection for the data among all the raid modes, mirror cant increase storage performancebut as it provides high level of protection for datait is specially used for storing critical data.
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