Present Terminology
Both drums and data cells have disappeared as products, so DASD remains as a synonym of a disk device. Modern DASD used in mainframes only very rarely consist of single disk-drives: most commonly "DASD" means large disk arrays utilizing RAID schemes.
Read more about this topic: Direct Access Storage Device
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“Any man that resists the present tides that run in the world, will find himself thrown upon a shore so high and barren that it will seem he has been separated from his human kind forever.”
—Woodrow Wilson (1856–1924)