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One of the storage device types displayed on the CA Auditor Hardware Device Display is the direct access storage device (DASD). As its name implies, DASD refers to all disk‑like storage devices, such as diskettes, mass storage systems, and data cells. Modern DASD devices, such as the IBM 3390, permit storage of over 60 gigabytes of data at a relatively low cost. Because DASD devices enable fast, random access to data, the role of magnetic tape has shifted increasingly to that of file backup. Tape is well suited to this role because it can hold vast amounts of data at very low cost. The new high‑speed, data‑streaming tape cartridge drives, such as the IBM 3840, accelerate this trend.
The storage media cannot be moved from the disk drive of most of the newer DASD devices. However, some DASD devices, such as the older IBM 3330s, 3340’s, and 3370’s do have removable media. These removable media disk drives can present a significant security risk if the computer environment is not physically secured. Owing to the age of these devices, it is unlikely that you will encounter any of them in your data center.
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