Page 355 - FUNDAMENTALS OF COMPUTER

NPP

NPP Memory 355

magnet. The laser increases the temperature of hmoVm h¡Ÿ& O~ gVh na boOa n‹S>Vr h¡, Vmo Vmn_mZ ~‹T>Vm
spot and the magnet puts the magnetic field. h¡Ÿ& Eogo _| Mwå~H$ H$s ghm`Vm go âbŠg g§J«{hV H$a Xr
Thus this is a read-write memory, may be em- OmVr h¡Ÿ& AV… `h EH$ àH$ma H$s Read-write _o_moar
ployed as secondary storage device. But it is h¡Ÿ& bo{H$Z `h AË`ÝV _h±Jr hmoVr h¡Ÿ& BgH$m EŠgog
costly. Another problem is their large seek time.
Q>mB©_ ^r A{YH$ hmoVm h¡Ÿ&
4.9 Comparison of Primary and Secondary Memory

S.No. Primary Memory Secondary Memory
1. In modern computers, it is a semi- It is a magnetic memory.
cond uctor memory.
2. CPU directly communicates with this CPU never communicates directly with this
memory. memory.
3. Cost per bit is high. Cost per bit is low.
4. Faster, access time is in ns (nano sec.). Slower, access time is in ms (milliseconds).
5. Essential part of computer system. Auxilliary memory.
6. Can be volatile (RAM) or Non-volatile Always non-volatile or permanent.
(ROM).
7. Programs and data currently needed Programs, software and big files not currently
are kept. needed by CPU are kept.
8. Used in smaller size. Used in larger size.
9. No moving parts. Moving parts are present.
10. Parallel Data Transfer. Serial Data Transfer.
11. Always Random Access. Can be serial or semirandom Access.

4.9 àmB_ar d goH§$S>ar _o_moar H$s VwbZm

S.No. àmB_ar goH§$S>ar

1. AmYw{ZH$ H$åß`yQ>am| _| `h EH$ AY©MmbH$ `h EH$ Mwå~H$s` _o_moar h¡Ÿ&
_o_moar h¡&
2. CPU grYo-grYo Bgr _o_moar go OmZH$mar CPU grYo-grYo Bg _o_moar go H$^r ^r OmZH$mar Zht
boVm h¡Ÿ& boVm h¡Ÿ&
3. à{V {~Q> H$m _yë` CÀM hmoVm h¡Ÿ& à{V {~Q> H$m _yë` H$_ hmoVm h¡Ÿ&
4. Vrd« hmoVr h¡Ÿ& EŠgog Q>mB©_ ns _| hmoVm h¡Ÿ& Yr_r hmoVr h¡Ÿ& EŠgog Q>mB©_ ms _|§ hmoVm h¡Ÿ&
5. H$åß`yQ>a H$m Amdí`H$ {hñgm h¡Ÿ& H$åß`yQ>a H$m ghm`H$ {hñgm h¡Ÿ&
6. `h dmînerb d Admînerb XmoZm| hmoVr h¡Ÿ& `h h_oem Admînerb hmoVr h¡Ÿ&
7. Amdí`H$ àmoJ«m_ d S>mQ>m Bg_| aIm OmVm h¡Ÿ& J¡a Oê$ar OmZH$mar Bg_| aIr OmVr h¡Ÿ&