primary storage memory n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Primary Storage: Memory PowerPoint Presentation
Download Presentation
Primary Storage: Memory

Loading in 2 Seconds...

play fullscreen
1 / 4

Primary Storage: Memory - PowerPoint PPT Presentation


  • 148 Views
  • Uploaded on

Primary Storage: Memory. Primary storage is directly accessible by the processor Memory: RAM = random access memory ROM = read only memory PROM/EPROM = programmable ROM RAM is volatile (not retained w/o power) cache, interrupts, memory, flags…. Secondary: Mass Data Storage .

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Primary Storage: Memory' - ciro


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.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
primary storage memory
Primary Storage: Memory
  • Primary storage is directly accessible by the processor
  • Memory:
    • RAM = random access memory
    • ROM = read only memory
    • PROM/EPROM = programmable ROM
  • RAM is volatile (not retained w/o power)
  • cache, interrupts, memory, flags…
secondary mass data storage
Secondary: Mass Data Storage
  • primary storage is directly accessible by the CPU (RAM, cache memory)
  • secondary storage is not directly accessed
  • data is transferred to primary memory when needed by processor
  • MDS is non-volatile - record and modify information (semi-)permanently
types of mds
Types of MDS
  • Punched surfaces

- earliest method; human readable

- punched cards, punched tape

  • Magnetic surfaces

- most widely used

- streaming tape, magnetic disks (floppy, hard, zip…)

  • Optical surfaces

- most durable

- optical disks (CD-ROM, laserdisc, DVD…)

comparisons of mds types

media:

size/capacity:

advantages:

disadvantages:

Floppy

3.5” = 720KB, 1.44MB, 2.88

5 ¼” = 360, 720KB (old)

8” = 180, 360KB (old)

inexpensive;

shareable

slow;

effected by magnetic fields, dirt, temp; corruptible

Hard

¼, half & full height,

51/4”, 8”

= 5MB… 100+GB?

fastest

not usually portable;

not expandable

Optical

CD = 4.5” =

80-650MBdata/74minAudio

Laser = 8”,12”

DVD = 3.8 - 17GB

massive capacity,

high reliability,

portability,

data & audio standard

read only

Removable

Clik = 25 - 40MB

Zip = 100-250MB

Jaz = 500M - 2GB

SuperDisk (3M - Imation) =120MB

faster & more capacity than floppies;

read/writeable

slower than hard;

more expensive than floppies

Magneto-optical MO

combination of technologies

reliable;

high capacity

expensive;

not as fast

Flash Memory

(newest)

solid state storage;

memory sticks; flashcards

no moving parts,

rewritable

very expensive;

no standard yet

Comparisons of MDS types