Physical Storage Media (Cont.)
{"Image DocumentName": "Physical Storage Media (Cont.)", "Image ImageDescription": "Flash memory \u2013 reads are roughly as fast as main memory; data survives power failure; but can support a only limited number of write/erase cycles. Magnetic-disk storage \u2013 primary medium for the long-term storage of data; typically stores entire database. data must be moved form disk to main memory for access, and written back for storage. direct-access \u2013 possible to read data on disk in any order. usually survives power failures and system crashes; disk failure can destroy data, but is much less frequent than system crashes. CIS552. Storage and File Structure.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}