Hard Disk

Hard Disk ka bunyaadi kam data ko store karma hai. Aik waqat aisa bhi thaa jub hard disk ka koe tasaver na tha aur floppy key zarye boot kya jaata tha. Iss key bad job hi program estamal karna hota tha is ki disk lijati thee. Sub sey pehley 20MB ki hard disk aayen to tehel-ka mach gayaa. Aaj hardisks ki taadad ka ye aalam hai key 20GB sey ziada capacity ki disks aam istamal horahe hain. Computer main storage ki astadad naapney ka pemana byte hai. Byte baazabtey khud 8 bits ka majmuaa hai aur ye aik huruf, hindsey, aalamat ya aik khali space key baraber hai. Kisi bhi disk ki data sambhalney ki ehalyaat ko issi pemaaney sey jaana jata hai.
Aam metric system key baraks jiss main aik kilo sey muraad 1000 hai, computer data main kilo sey muraad 1024 hai. iss lehaaz sey jo paimana baney gaa wo iss tarha hogaa.
8 bits =1 byte
1024 bits =1 kilo byte (KB)
1024 byts = 1 mega byte (MB)
1024mega bytes = 1 gega bytes (GB)
1024 gega bytes = 1 tera byte (TB)
Hard disckon ki tadad ka andazaa aik mamoli missal sey lagaya ja sakta hai. 1.44 mega byte ki aik floppy kay ander 1509949 huraf, alamatain ya hindsey aasaktey hain. 20 gega byte ki aik hard disk kay andar ktney huraf aasaktey hain iss ka andazaa yon kya jasakta hai key aik mega byte main 1048576 bites hotain hain inn ko doo martaba 1024 sey aur phir hasil zarab ko 20 sey zarab dey kar daikh lain jo tadad hasil hogee wo 21990232555520 hia.
Hard disck ki iss tadad ka taluk iss key zahiree hajam sey nahi hain yaani 20 gega byte ki hard disk itni he jisamat ki hogee jitni jisamat 120 mega bytes isstadad ki hamil hard disk ki hosakti hai halankey iss tadad key lehaaz sey wo iss sey secro gunaa bari hai.