Hard Disk Storage (HDS) or Hard Drives (HD)

the storage componet of Cloud computing requires that data be online for real-time access by remote users. This requires lots of Hard Drives and if you are going to provide 24/7 access to the data on those hardrives you usually need to put the data in a couple of places to assure if one does down the other is there to back it up. For repositories where preservation is a leading concern, more than two HDs are required and preferibally in different locations in case of disaster recovery.