1 / 13

G043 – Lecture 05 Computer Storage

G043 – Lecture 05 Computer Storage. Mr C Johnston ICT Teacher www.computechedu.co.uk. Session Objectives. Know the different storage units for typical devices, Understand the types of computer storage devices available and the properties they can have,

melosa
Download Presentation

G043 – Lecture 05 Computer Storage

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. G043 – Lecture 05Computer Storage Mr C Johnston ICT Teacher www.computechedu.co.uk

  2. Session Objectives • Know the different storage units for typical devices, • Understand the types of computer storage devices available and the properties they can have, • Understand the need for backing storage and the methods which can be used to carry out this task.

  3. Storage Units • Computer storage is measured in bytes, • A byte is made up of eight binary bits, • Typical larger unit include: • KiloByte (KB) – Digital 1000 Bytes/Binary 1024 Bytes • (floppy disks) • MegaByte (MB) – Digital 1,000,000 Bytes/Binary 1,048,576 Bytes • (CD R/RW, FLASH STORAGE) • GigaByte (GB) – Digital 1,000,000,000 Bytes/Binary 1,073,741,824 Bytes • (RAM, Average HDD, DVD R/RW, BACKUP TAPES, Flash Storage, BLU-RAY) • TeraByte (TB) – Digital 1x1012 Bytes / Binary 1,099,511,627,776 Bytes • (Large HDD, NAS Boxes) • PetaByte(1x1015), ExaByte(1x1018), ZettaByte(1x1021), YottaByte(1x1024) • Hitachi NAS 3090 can store up to 2PB of data!!!

  4. Types of Storage • Computers have: • Internal Memory – RAM / ROM • Primary Storage - HDD • Backing Storage – FDD/ Flash Memory / Optical Disks / Tapes

  5. ROM BIOS CHIP Internal Storage • Made up of ROM and RAM: • ROM (read only memory) has permanent information stored on an IC chip. BIOS, Chipset and Firmware, • RAM (random access memory) is temporary storage where information is stored before being saved to another device, • RAM is volatile and when power is lost all the contents is wiped out.

  6. Types of RAM • 168pin SDRAM DIMMS – have a double notch (PC100, PC133) - obsolete • 184pin DDR SDRAM DIMMS - have a single notch in the middle – old machines SDRAM – Synchronous Dynamic Random Access Memory DIMMS – Dual In-Line Memory Module DDR – Double Data Rate

  7. 240pin DDR2 DIMMS – have a single notch in the middle first available 2003 • 240pin DDR3 DIMMS – have a single notch different place to DDR2, first available 2007, frequently have a heat sink, • When buying RAM need to ensure that motherboard is compatiable and supports the clock speed

  8. Properties of Hard Disk Drives • Physical Features: • Size • Number of Heads, • Number of sectors, tracks, cylinders • Rotation Speed (7200 rpm) • Logical Features: • File System • FAT16, 32, NTFS • Partitions • Folder Structure

  9. Optical Drives / Disks • Drives • CD ROM Drive / CD R Drive / CD RW Drive • DVD ROM / DVD +/-RW Dual Layer / RAM • Blu-Ray • Must ensure have correct type of disk and speed rating for your burner when specifying.

  10. 20mm 43mm XD Card 36mm 25mm Compact Flash Card SD Cards Small, Mini, Micro Flash Memory • Pen Drives, Memory Sticks, USB Sticks, Thumb Drives • Multimedia Card (MMC), • Available in standard, compact and subcompact • Siemens AG, SanDisk • Secure Digital Card (SD), • Based on MMC cards • Available in small, mini and micro • Panasonic, SanDisk, Toshiba, Kodak • Compact Flash, • Original type of card (1994) • SanDisk • XD • Olympus, Fujifilm

  11. NAS Box FDD and Disk External Zip Drive and Disk Other Storage Devices • Floppy Disks (FDD) – small storage capacity not often used now • Zip Drive – not as popular as could have been, internal and external versions • External HDD – popular device for backups • NAS (Network Attached Storage) – massive storage pools for networks • Video showing different storage media

  12. Backing Storage • Creating backups of work is very important especially in business situations, • A common device to backup to is a tape drive – tapes hold c400GB of data, • Use of tapes in an order creates a backup plan – a common backup plan is: • The “God Father, Father, Son” approach • Backups can also be made to another server / external HDD / pen drive / optical media.

  13. Topic Exercise • Download: Computer Storage Exercise.doc from my website. • Complete the questions using the internet and text book to help.

More Related