Storage Devices Storage medium(media) Storage devices (drives) Hard disk(3.5%2.5 diameter and Drives Tape(business computers) Drives CD(compact disc) Drives.versatile DVD(digital video disc) Drives.versatile SD Card Drives USB Drives Storage meduim Data Raw data Proccessed Data Storage devices (drives) Interaction between storage and
Storage Devices Storage medium (media) Storage devices (drives) mechanical Hard disk ( 3.5” 2.5 diameter and 1.8”(Apple) Drives Tape (business computers) Drives CD (compact disc) Drives.versatile DVD (digital video disc) Drives.versatile SD Card Drives USB Drives Data Raw data & Proccessed data Storage devices (drives) Data Storage meduim Interaction between storage and components
Storage Devices Access time Is average time it takes a computer to locate data on the storage meduim and read it ms:disk drive is measured in milliseconde(1000 of 1 sec.) ms acess tme ls beter than m Data transfer rate: Is amount of data a storage device can move per second from the storage meduim. KBps:kilobytes per second T600 KBps is faster than one with a 300 KBps
Access time : - Is average time it takes a computer to locate data on the storage meduim and read it - ms: disk drive is measured in milliseconde(1000 of 1 sec.) 6 ms access time is beter than 11ms. Data transfer rate: - Is amount of data a storage device can move per second from the storage meduim. - KBps: kilobytes per second 600 KBps is faster than one with a 300 KBps Storage Devices
Magnetic Disk (HD) Read-write head: Mechanism to write and read data. Data delete by change the magetic orientation. Data can be changed or destroyed by mold,dust,heat and mechanical problems. 5m52p88at -lracks 1.Prior ta data one sector tracks 2.The iat the
Read-write head: Mechanism to write and read data. Data delete by change the magetic orientation. Data can be changed or destroyed by mold, dust, heat and mechanical problems. Magnetic Disk (HD)
Storage Devices ·Read-write head: rpm(revolutions per minute):is a measure of speed that the read-write head can position itself over specific data. 7200 rpm drive is faster than a 5400 rpm drive 。Controller Read/write heads Case Teetduels com Data ·Spindle Platters Page:79(Ultra ATA,EIDE,SCSI annd DMA)
• Read-write head: rpm (revolutions per minute): is a measure of speed that the read-write head can position itself over specific data. 7200 rpm drive is faster than a 5400 rpm drive. Page: 79 (Ultra ATA, EIDE, SCSI annd DMA) Storage Devices
Storage Devices 。Tape drive Read and write is a sequential. 000101000010010100110100 Read/Write Electronics HAN
• Tape drive Read and write is a sequential. Storage Devices