Page 347 - FUNDAMENTALS OF COMPUTER

NPP

NPP Memory 347

Metalic Protection Shutter: This is a _oQ>o{bH$ àmoQ>oŠeZ eQ>a: `h pñà¨J go bJm hþAm
metalic shutter which is attached with spring. YmVw H$m eQ>a hmoVm h¡Ÿ& O¡go hr âbm°nr H$mo S´>mB©d _| S>mbm
When the floppy is inserted it opens the slot to OmVm h¡ d¡go hr `h gaH$ OmVm h¡ Am¡a ñbm°Q> Iwbm hmo
head.
OmVm h¡Ÿ&
Spindle Connector: The small hole on pñnÝS>b H$ZoŠQ>a: YmVw Ho$ h~ na EH$ N>moQ>m hmob
the metal hub connects the floppy to the spindle. hmoVm h¡ Omo âbm°nr H$mo Kw_mZo hoVw Amdí`H$ nH$‹S> àXmZ
H$aVm h¡Ÿ&
High Density Sensor hole: This hole on CÀM KZËd hmob: \$m°a_oqQ>J Ho$ g_` `h hmob
the opposite side of tab tells the drive that this ~VmVm h¡ {H$ âbm°nr CÀM KZËd H$s h¡Ÿ&
is a high density floppy. This information is
needed for formatting.
Stress Relief Notch: These are two small ñQ´>og [abr\$ Zm°M: `o Xmo AY© d¥ÎmmH$ma {N>Ð hmoVo
half circular notch, help in proper alignment h¢ Omo âbm°nr H$mo ghr bJZo _| _XX H$aVo h¢ Am¡a OoHo$Q>
and reduce the stress on jacket.
H$mo A{YH$ ~b bJZo go ~MmVo h¡Ÿ&
Storage Capacity of 3.5” Floppy 3.5” âbm°nr H$s j_Vm
Mainly there are three types of storage _w»`V… `o VrZ àH$ma H$s j_VmAm| _| nmB© OmVr h¢…
capacity disks are available in 3.5”:
DSDD – 720 KB, DSHD – 1.44 MB, DSED – DSDD – 720 KB, DSHD – 1.44 MB, DSED –
2.88 MB 2.88 MB
DSDD (Double Sided Double Density) DSDD âbm°nr: BZ_| 80 Q´>oH$ à{V gVh na hmoVo
Floppy: It has 80-tracks per surface, and 9 h¢ Ÿ VWm à{V Q´>oH$ na 9 goŠQ>a hmoVo h¢Ÿ& BgH$s amoQ>oeZ
sectors per track. The rotation speed is 300 RPM. J{V 300 RPM (amoQ>oeZ/{_ZQ>) hmoVm h¡Ÿ& Bg_| 250KB
Data Transfer rate is 250 KB/sec.
à{V goH§$S> H$s Xa go S>mQ>m Q´>m§g\$a hmoVm h¡Ÿ&
DSHD (Double Sided High Density) DSHD âbm°nr: Bg_| à{V gVh na 80 Q´>oH$ hmoVo h¡
Floppy: It has 80 tracks per surface and 18 VWm à{V Q´>oH$ _| 18 goŠQ>a hmoVo h¢Ÿ& `h ^r 300 RPM go
sectors per track. It has 300 RPM speed. Date
transfer rate is 500 KB/sec. Ky_Vr h¡Ÿ& Bg_| S>mQ>m Q´>m§g\$a 500KB à{V goH§$S> hmoVm h¡Ÿ&
DSED (Double sided Extra-High Density) DSED âbm°nr: Bgo Vmo{e~m Zm_H$ H§$nZr Zo {ZH$mbm
Floppy: It was introduced by Toshiba h¡Ÿ& Bg_| d{Q>©H$b [aH$m°{S>ªJ H$aHo$ A{YH$ KZËd àmá
corporation. It uses vertical recording to achieve H$aVo h¢Ÿ&
extra high density.

4.5 Hard Disk 4.5 hmS>© {S>ñH$
Hard Disk is a secondary storage device hmS>© {S>ñH$ AZoH$ Eë`y{_{Z`_ H$s ßboQ>m| go ~Zr
which contains large number of aluminium hmoVr h¡& àË`oH$ Eë`y{_{Z`_ H$s ßboQ> na Am`aZ
disks coated with iron oxide. All the disks are Am°ŠgmB©S> H$s naV M‹T>r hmoVr h¡, Omo {H$ EH$ Mwå~H$s`
attached to a common spindle as shown be- nXmW© h¡ Ÿ& {ZåZ {MÌ _| Xem©E AZwgma àË`oH$ ßboQ> EH$
low: hr pñnÝS>b go Ow‹S>r hmoVr h¡…