tailieunhanh - Introduction to Computing (14)

CSC to Computing Lecture 14 Dr. Iftikhar Azim Niaz. ianiaz@. 1 Last Lecture Summary .n Describing Storage Devices. q Operations, Storage Capacity and Access Magnetic Storage Devices. q Formatting, Track, Sector, Cylinder. q FAT 16, FAT 32, Floppy disk. q Characteristics, Parts, Capacity, Hard disk. q Characteristics, parts, operations, formatting. 2 Hard Disk A disk controller consists of a special-. purpose chip and electronic circuits that. control the transfer of data, instructions, and. information from a disk to and from the. system bus and other components of the. computer. 3 Hard Disk SATA (Serial AT Attachment). q Bus interface for connecting host bus adapters to. mass storage communicate via a high-speed serial cable. over two pairs of SATA rev (released in 2009_. q Raw bandwidth 6000 Mbps. q Transfer Speed 600MBps. 4 Enhanced Integrated Drive uses parallel signals to transfer data,. instructions, and informationn can support up to four hard disks at 137 GB. per diskn data transfer rates up to 133 MBpsn provide connections for optical disc drives and. tape drives 5 Small Computer System an intelligent, peripheral, buffered, peer to peer. use parallel signals, can support up to eight or. fifteen peripheral provide up to 640 MBps data transfer rates. 6 Serial Attached uses serial signals to transfer allows up to 65,535 devices through the use of. data transfer rates of 750 MBps and Advantages. q thinner, longer cables. q reduced interference. q less expensive. q Faster speed and. q support for many more connected devices at once. 7 External and Removable Hard Used to back up or transfer Storage capacities > Slower transfer rate than internal Hard disks. External hard disk—freestanding Removable hard disk—. hard disk that connects to system hard disk that you insert . unit thru USB or Firewire port and remove from hard . disk drive. 8External Hard disks. 9 External Hard Disks ­ Transport a large number of Back up important files or an entire internal hard disk. (several external hard disk models allow you to back. up simply by pushing a button on the disk).n Easily store large audio and video Secure your data; for example, at the end of a work. session, remove the hard disk and lock it up, leaving. no data in the Add storage space to a notebook computer, including. notebooks and Tablet Add storage space to a desktop computer without. having to open the system unit or. connect to a network RAID (redundant array of independent disks) is. a group of two or more integrated hard A network attached storage (NAS) device is a. server connected to a network with the sole. purpose of providing storage. 11 Online Services on web that. provides storage for. minimal monthly Files can be acces