A mode in which online direct access storage devices are tested. No writing is done on the device in order to protect data.; 一種用以測試聯(lián)機(jī)直接存取存儲設(shè)備的方式。為了保護(hù)數(shù)據(jù),不對該設(shè)備進(jìn)行寫入操作。