TAILIEUCHUNG - Lecture Introduction to computing - Lecture 14

This chapter define the term average access time and describe how it is measured, explain why file compression is a factor in drive performance, define the term data transfer rote and describe how it is measured, explain two steps you can take to optimize the performance of your computer’s hard disk, identify four drive interface standards commonly used in PCs. | CSC 101 Introduction to Computing Lecture 14 Dr. Iftikhar Azim Niaz ianiaz@ 1 1 Last Lecture Summary Describing Storage Devices Operations, Votality Storage Capacity and Access Time Magnetic Storage Devices Formatting, Track, Sector, Cylinder FAT 16, FAT 32, NTFS Floppy disk Characteristics, Parts, Capacity, Operation Hard disk Characteristics, parts, operations, formatting 2 Hard Disk Controller 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 Hard Disk Controllers SATA (Serial AT Attachment) Bus interface for connecting host bus adapters to mass storage devices communicate via a high-speed serial cable over two pairs of conductors SATA rev (released in 2009_ Raw bandwidth 6000 Mbps Transfer Speed 600MBps EIDE Enhanced Integrated Drive Electronics uses parallel signals to transfer data, instructions, and information. can support up to four hard disks at 137 GB per disk. data transfer rates up to 133 MBps. provide connections for optical disc drives and tape drives SCSI Small Computer System Interface an intelligent, peripheral, buffered, peer to peer interface use parallel signals, can support up to eight or fifteen peripheral devices provide up to 640 MBps data transfer rates SAS Serial Attached SCSI uses serial signals to transfer data allows up to 65,535 devices through the use of expanders data transfer rates of 750 MBps and higher Advantages thinner, longer cables reduced interference less expensive Faster speed and support for many more connected devices at once External and Removable Hard Disks Used to back up or transfer files Storage capacities > 1TB Slower transfer rate than internal Hard disks External hard disk—freestanding hard disk that connects to system unit thru USB or Firewire port Removable hard disk—hard disk that you insert and remove from hard disk drive .

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