Page 345 - FUNDAMENTALS OF COMPUTER

NPP

NPP Memory 345

it becomes write protected. An LED and pho- AWm©V² A~ Bg âbm°nr na Hw$N> god Zht {H$`m Om
todiode assembly is used to perform the task. gH$VmŸ& Eogm LED d \$moQ>mo {S>Q>oŠQ>a Ho$ H$maU hmoVm
When no light is detected by photo detector, it h¡Ÿ& O¡go hr \$moQ>mo {S>Q>oŠQ>a H$mo bmB©Q> Zht {_bVr h¡ `h
disables write part of head logic. Index hole is hoS> Ho$ {bIZo dmbo {hñgo H$mo ~§X H$a XoVm h¡Ÿ& àW_
there to identify first sector on the track. Other goŠQ>a hoVw Bg_| B§S>oŠg hmob Xem©`m J`m h¡ Ÿ& ~mH$s
sectors can be numbered using hard sectoring
or soft-sectoring. A plastic ring protects edges goŠQ>am| Ho$ Z§~a hmS>© goŠQ>[a¨J `m gm°âQ> goŠQ>[a¨J go V`
of surface from any damage central hole is {H$E Om gH$Vo h¢ Ÿ& ßbmpñQ>H$ H$s [a¨J H|$Ð _| Xem©B© JB©
attached to spindle and floppy rotates. h¡Ÿ& `h Mw§~H$s` gVh H$mo ~MmZo Ho$ {bE bJmB© OmVr h¡Ÿ&
H|$Ð H$m hmob A§Xa OmH$a pñn¨S>b go Ow‹S> OmVm h¡ Am¡a
âbm°nr KyU©Z H$aVr h¡Ÿ&
Storing capacity of 5.25” Floppy 5.25 ''âbm°nr H$s j_Vm
Depending on whether the information is AJa EH$ hr gVh na OmZH$mar {bIr JB© h¡ Vmo
recorded on only one surface (single sided) or Bgo Single-Sided (SS) VWm XmoZm| Va\$ {bIr JB© Vmo
both surfaces (Double-sided), and the record-
ing density (sectors per track and tracks per Bgo Double-sided (DS) H$hVo h¡Ÿ& gmW hr [aH$m°{S>©J
surface), there are following types of 5.25” KZËd Ho$ AmYma na Bgo Double-Density (DD) `m
Floppy: High-Density (HD) H$hVo h¡Ÿ& 5.25'' H$s âbm°{ng
{ZåZ j_VmAm| _| CnbãY h¢…
DS DD - 360 KB DS HD - 1.2 MB DS DD - 360 KB DS HD - 1.2 MB
DSDD (Double-Sided Double Density) DSDD âbm°nr (S>~b gmBS>oS> S>~b S>oZ{gQ>r âbm°nr)
Floppy
Double sided means the information is re- Bg_| XmoZm| Va\$ [aH$m°{S>©J H$s OmVr h¡ Am¡a KZËd
corded on both the sides. A double density Bg àH$ma hmoVm h¡…
means the recorded density is as follows:
40 tracks per surface, 9 sectors per track 40 Q´>oH$ à{V gVh, 9 goŠQ>a à{V Q´>oH$
Each sector contains 512 Byte of àË`oH$ goŠQ>a _| 512 Byte hmoVo h¢Ÿ& `h KZËd
information, This density is provided by DOS DOS (Disk Operating System) V` H$aVm h¡Ÿ& BZH$s
(Disk Operating System). The storage capacity
of DSDD is 360KB. The rotational speed of j_Vm 360KB hmoVr h¡Ÿ& `o 300RPM (Rotation Per
these drives is 300 RPM (Rotation Per Minute). Minute) H$s J{V go Ky_Vr h¡ VWm 250KB/Sec H$s Xa
Data transfer rate is 250KB/sec. go OmZH$mar ñWmZm§§VaU H$aVr h¡Ÿ&
DSHD (Double Sided High Density) Floppy DSHD (S>~b gmBS>oS> hmB© S>oZ{gQ>r) âbm°nr
The DOS uses following storage density DOS Ûmam XmoZm| gVhm| na {ZåZmZwgma S>mQ>m [aH$m°S>©
for such drives:
{H$`m OmVm h¡…
80 tracks per surface, 15 sectors per track 80 Q´>oH$ à{V gVh, 15 goŠQ>a à{V Q´>oH$
Each sector has 512 Byte of information, àË`oH$ goŠQ>a _| 512 ~mB©Q> hmoVo h¢Ÿ& `o 360 RPM
drive spins at 360 RPM. The total capacity is H$s J{V go Ky_Vr h¢ Am¡a 500 KB à{V goH§$S> H$s Xa
1.2 MB. The Data Transfer rate is 500 KB/sec. go S>mQ>m Q´>m§g\$a H$aVr h¡Ÿ&