High Quality Content by WIKIPEDIA articles! In computing, a massive array of idle disks is a system using hundreds to thousands of hard drives for near-line storage of data. MAID is designed for 'Write Once, Read Occasionally' applications. In a MAID each drive is only spun up on demand as needed to access the data stored on that drive. This is not unlike a very large 'Just a Bunch Of Disks' but with power management. Compared to RAID technology a MAID has increased storage density, and decreased cost, electrical power, and cooling requirements. However, these advantages are at the cost of much increased latency, significantly lower throughput, and decreased redundancy. Low drive utilization rates may actually reduce reliability in consumer-oriented large PATA and SATA drives. Drives designed for multiple spin-up/down cycles are significantly more expensive. Latency may be as high as tens of seconds. MAID can supplement or replace tape libraries in hierarchical storage management.

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