Monday, 21 December 2015

What is state solid disk (ssd)?

स्टेट सॉलिड डिस्क को स्टेट सॉलिड ड्राइव कहते है !  इसमें   किसी  प्रकार की  डिस्क नहीं होती है ! न ही डिस्क को चलाने के लिए मोटर  का प्रयोग होता है !  यह एक "  नॉन  वोलेटाइल स्टोरेज डिवाइस " है !  यह फ़्लैश मेमोरी की तरह  होती है  जो कि डेटा स्टोरेज के लिए  "इंटीग्रेटेड सर्किट असेंबली" को मेमोरी की  तरह यूज़ करती  है   !   

पुरानी हार्डडिस्क की तुलना मे ssd एक  "ऐरे ऑफ़ सेमीकंडक्टर"  मेमोरी  होती है !  जो की ics को use  करता है !   न कि  magnatic of  opotical storage media !

ssd  मे read /write के  लिए कोई ;machanical पोर्ट्स नहीं होता है !  जबकि  hhd मे  read  /write  के लिए spinning  disk and moving read/write head होता है !

ssd silent work करती है ! speed ज्यादा होती है !
  


                                                                                                                                                                                                                                                                                    

Saturday, 13 December 2014

Dual Boot Support

In a dual boot configuration you essentially have two OS on the Computer.  (Window 98 and Window 2000).  At boot time you have the option of selecting which OS you want to use.  Both OS can share the
same disk space (provided they use compatible formats like FAT32 for 98/2000 or in some cares can use sap rate disk.


What is the Virtual FAT

An extension of the FAT file system that was Introduced with window 95.  It argument-ed the 8.3 file naming convention and allowed file names with up 255 character.  It created two names for each file. Along name and an 8.3 compatible name so that older programs could still access files.  When VFAT was incorporated into windows 95.  It use 32 bits code for improved disk access while keeping the 16 bit naming system for backward compatibility with FAT .  It also had the 2GB disk partition limitation.

What is resistor

Resistors offers resistance to the flow of current represented by  "R" and its units is "Ohm".
Factors affecting Resistors-

  1. Resistivity of a meterial.
  2. Length:-  Resistance is directly proportional to length.
  3. Cross sectional area:-  Resistance is inversely proportional to the cross sectional area (A).
  4. Temperature:- all material change resistance by the same amount when temperature changes.
Type of Resistors:-

  1. Fixed Resistors
  2. Variable Resistors
Type of Fixed Resistors-  
  1. Carbon
  2. wire Wound
  3. Fusible Resistors
Type of Variable Resistors-   
  1. Rheostate
  2. Potentiometer 
Carbon Resistors-  It is made of carbon and graphite mixed on the powered isolating materiel as a binder.
The resistence value is from 1 Ohm to 20 Ohm.
           Power rating is 1/4 , 1/2, 2 watt.
Wire wound Resistors-  The resistance wire is wrapped round and isolating core power rating 5 watt to 100 watt the wire may be tonguston or maganin.
Fusible Resistors-  When power rating is exceeded fusible resistors burn out used for dual purpos as a resistors and as a fuse wire.
Variable Resistors:-  It can be corben  or wire wound resistors. There  are two type of variable resistors.

Measurement:-  Measure the value with the equipment.
Example:-   Multimeter





Monday, 13 October 2014

Regaining Computer Hard disk drive

1.  Open My Computer.
2.  Right-click on the hard disk drive that you wish to regain hard-disk drive space.
     Example: right click on the C drive.
3.  Click Properties.
4.  Within the disk clean -up button located next to the pie-chart.
5.  Window will scan the computer for all files available to cleanpup.
6. Regaining Computer Hard-disk drive Once in the Disk-cleanup window check each of the boxes (except "compress old
     files") that are taking disk space and click OK and then yes if you wish to proceed. 

Monday, 15 September 2014

Windows 2000/NT system files

Boot.ini-  Define the location of the Windows NT and Windows 2000 system files.

Ntldr-  is responsible for loading the operating system.

Bootsects.dos-  The bootsects.dos files holds the boot sector information of any other operating system that are loaded on the system.

NTdetect.com-  This files is responsible for detecting hardware and building a hardware list.

NTbotted.sys-  This files is used only when the system boots from a SCST device that does not have a BIOs installed.

NTuser.dat-  The NTuser.dat files contains configuration information specific to each user define on the system.  Each user to successfully logon to the system will have an NTuser.dat file created in the c:\Document and settings\Username folder.
When the user logon to the system, the information in the NTusedr.dat file is placed in the HKEY_USER subtree of the registry.

Major Operation Utilities

Defreg.exe-  Fregmentation of the disk is double whammy-not only does it slow the system down because has hard disk has to work harder to retrieve that files the increased work load can literally wear the hard-disk out quicker then it would otherwise so, defregmenting your hard drive does more then just speed the system up-it could literally mean that it last longer.

Fdisk.exe-  Fdisk the utility used to partition the hard disk.  A hard-disk has to have one formatted partition to hold the operating system .  This partition canbe created by Fdisk or by the window setup program when the booted from the CD ROM drive.

Windows XP Backup-  To access the Windows XP Backup utility.

Click start---------->All Programmes------------>Accessorries------------>System tools----->Backup

Backup strategies-  When it comes to choosing a type of backup there are three primery choice full incremented and differential backukp.

Full Backup-  Full backup can take they are often restricterd to weekly or m onthly use, though the increasing speed the capacity of backkup media is making nightly full backup a much more realistic proposition even for those with gigabytes of data.

Incremental backup-  An incrementaol backup includes onlyh the files that have changed or been created since the last full backup.  To determine whetgher a file has changed since the last full  backup, the backup software looks at the archieve bit seeting on the file.  Only files and folders with the archieve bit set to on will be backed up.  Once the file  has been backup. the archieve bit is cleared so that the file is not backed up again unnecessarily.

Differential Backup-  Differential backup the files trhat have changed since the last full backup.

Scandisk-  Scandisk is a widely used utility that is used to detect and correct file problems and errors on hard-disk and floppy disk.

CHKDSK-  chkdsk utility that is used to check and if necessary repair the file system on a hard-disk .  IKt is a DOS based utility.

Disk Cleanup-  The disk cleanup feature in Window 2000 the Window XP scanyour computer hard-disk looking for files such as temprary files and temprapry internet files that canbe deleted to freeup space on the disk.

Formet-  The formet command is the tools used in the final step to lprepare a disk for use. The formet command can be used on both hard disk and floopy disk.

Device Manager-  Device Manager to identify that hardware has been detected by the system, the resource used by device and whether the device is currently functioning.

If a resource conflict is shown in Device manager you can manually change resource to correct the conflict.

Device that are not recognize byh the system or that are incorrectly configurredc will be displayed with the yellow circle thatr contains either a question mark or an exsclamation point .  A red X indicates that the device has been disabled.

msconfig.exe-  The MSconfig utility enable you to safely modify legacy Windows files without making parmanent changes .  It allow you to castomise these files, determining which of the legacy file Windows to use.

Regedit.exe-  The regedit utility enable you to nevigate through the registry modify and search through the values in the registry and manually export the entire registry to create a backup.

Regedit is used by all version of windows since Windows 95.

Regedit canbe used to expert the regestry for backup purpose and emport that file when needed.

Sysdit.exe-  The sysdit utility lets ;you edit the legacy system files simultaneously, including the Auytoexec.bat, WIN.ini System.ini, Config.sys, and protocol.ini files.

Event Viewer-  The Event viewer utility in windows NT/2000/XP provides access to the various syhstem logs. These provide useful information on now the system is running oand issue that have occurred.

Attrib.exe-  This command line utility is used to change or view the attribute of a file or folder.

Extract.exe-  The extract utility is used to manually extract Windows installation files.

Attrib- The attrib command is used to and modify the attributes of a file.  File attribute include hidden (h)  system(s) read-only (r) and archieve (a) file attributes are discussed in detail later in the chapter.

You can view the attributes of an individual file by typing attrib followed by the file name. To add and remove the attributes from that file, use the + and - characters.

Example-  If you want to makea file called comptia.bat a hidden  and read - only file, you would type the following.

                                                      attrib +h  +r  comptia.bat


Copy-  The copy command used to coopy file from one location to another from the command line.

Example-  This command will copy a file from the floppy disk to the hard-disk.

                                                                copy a:\text.doc c:\







                                                      

Tuesday, 26 August 2014

Motherboard's Parts

सिस्टम पैनल कनेक्टर -  सेंट्रल प्रोसेसिंग  के ऊपर वाला हिस्सा जिसमे पावर स्विच लीड रिसेट स्विच  हार्ड डिस्क लीड कनेक्ट की जाती है /

यूनिवर्सल सीरियल बस - यह ९ पिन का होता है/ इसे कॉम्पेक्ट डिस्क रोम में कनेक्ट करते है/ इसे  लागाने से कोई भी कॉम्पेक्ट डिस्क आटोमेटिक रन करती है.

एनालॉग ऑडियो कनेक्टर -  चार पिन का होता है /

फ्रंट ऑडियो कनेक्टर -   ९ पिन का होता है/  माइक्रो फ़ोन स्पीकर  हेडफ़ोन कनेक्ट करते है/

गेम और मिडी कनेक्टर-  यह १५ या १६ पिन का होता था।  इसमें जॉयस्टिक जोड़ते थे /

A T X ट्वीन बोर्ड कनेक्टर -  यह कनेक्टर p 4  तक २०  का उसके बाद २४ पिन का आया है.

ATX पावर कनेक्टर-   कनेक्टर P 4  तक २० पिन का इसके  बाद २४ पिन का आया है /

सेंट्रल प्रोसेसिंग यूनिट और चेसिस फैन कनेक्टर  -  यह कनेक्टर P ४ तक ३ पिन का और उसके बाद ४ पिन का आया है/

सीरियल एडवांस टेक्नोलॉजी अटैचमेंट-  इसमे 7  कहीं कहीं 8 पिन होती हैं /  काले रंग का कनेक्टर  होता है और लाल रंग की केबल है /

आई   डी  इ  कनेक्टर -  यह ४० पिन का होता है लगभग हर कंप्यूटर में  है /  इसके द्वारा कॉम्पेक्ट  डिस्क और हार्ड डिस्क  को जोड़ते है/

एफ डी डी -   यह ३४ पिन का होता है /

जम्फर -  यह ३ पिन का होता है / यह हार्डवेयर की सेटिंग के काम आता है /

क्लियर सिमोस जम्फर-  सिस्टम में किसी भी प्रकार की सेटिंग हो जाती है/ जिसकी वजह से डिस्प्ले नहीं आता है बूट नहीं करता है /

यूनिवर्सल सीरियल बस बैकअप जम्फर   -   यह usb  को इनेबल और डिसएबल करने के काम आता है/

बायोस कॉन्फिग जम्फर -   बायोस में जाने के बाद कुछ सेटिंग नहीं कर पाते है / तो बायोस  जम्फर की स्थिती बदल कर कर सकते है/

एक्सपेंशन स्लॉट्स-

MCA स्लॉट्स -    १९८० में आया था/
ISA स्लॉट्स -  ८ बिट और १६ बिट का था /
EISA स्लॉट्स -  p 3  मदरबोर्ड में आया था इसमें ९८ पिन होती थी/
एक नौच होता था और  का होता था/
VESA स्लॉट्स-  ३२ बिट का था पुराने समय में चलता था PCI स्लॉट्स के बराबर था/

PCI स्लॉट्स -  ६४  बिट्स का स्लॉट्स है /सफ़ेद रंग का होता है/ स्पीड  मेगाहर्ट्ज़ है/

पीसीआई एक्सटेंडेड- इसे hp कॉम्पेक्ट और आई बी ऍम ने मिलकर बनाया था/इसमें केवल लेन कार्ड लगता है स्पीड ५३३ मेगा हर्ट्ज़ है/

PCI एक्सप्रेस-  यह आजकल आधुनिक तकनीक में काम करता है/  यह काले रंग का स्लॉट्स होता है/  इसमें डिस्प्ले कॉर्ड लगते है/ इसमें ८० मेगाहर्ट्ज़ स्पीड होती है/

एडवांस मॉडेम रेसर -  साउंड और मॉडेम के लिए यूज़  करते है /  मदरबोर्ड के किनारे काले रंग के बीच में सिंगल नौच होता है/

कम्युनिकेशन नेटवर्क रेसर -  मदरबोर्ड के साइड में होता है/ सिंगल नौच होता है इसमें लेनकार्ड और मॉडेम लगी होती है/

एक्सेलरेटेड ग्राफ़िक -कार्ड -  यह भूरे रंग का होता है / इसमें ग्राफ़िक कार्ड लगाते है/

सेंट्रल प्रोसेसिंग यूनिट सॉकेट और स्लॉट्स -  यह सॉकेट सेंट्रल प्रोसेसिंग यूनिट के लिए होता है/इसमें माइक्रो प्रोसेसर लगाया जाता है/  यह सॉकेटसॉकेट और स्लॉट्स   में काम करे है /

सुपर इनपुट /आउटपुट कंट्रोलर चिप-  मदरबोर्ड में सबसे बड़ी तीसरी बड़ी चिप होती है/
यह सारी इनपुट/आउटपुट डेटा लाने व ले जाने  करती है /

ऑडियो कंट्रोलर चिप-चिप चकोर होता है/ और मदरबोर्ड के किनारे है/  जिस कंपनी  का चिप होता है/ उसी कंपनी का ड्राइवर  यूज़ करते है/  यह चिप पेरीफेरल कॉम्पोनेन्ट इंटरफ़ेस स्लॉट्स और  कैबिनेट वाल के बीच में होता है/

फ़्लैश रैम बायोस -  ३२ पिन या ४० पिन की होती है/ बायोस में जाकर जब सेव है/ तो यह सारी ईएस चिप में सेव होती है/

माउस पोर्ट - हरा रंग का  होता है /

की बोर्ड -  बैगनी रंग का होता है/

 वीडिओ पोर्ट -  डी बी १५ फीमेल ५+५+५ लेटेस्ट वीडियो पोर्ट

 सीरियल पोर्ट -  डी बी ९ और डी बी १५ मेल कनेक्टर

मॉसफेट (मेटल ऑक्साइड सेमीकंडक्टर फील्ड इफ़ेक्ट ट्रांजिस्टर )-  मदरबोर्ड में छोटी- छोटी चिप होती है/ जिसमे ३ पिन होती है/जिसमे एक छोटी पिन होती है/जो आधी टूटी होती है/  जो वोल्टेज रेगुलेट  वजह से कब ज्यादा और कब काम सप्लाई की आवश्यकता होती है/ इसको मेन्टेन करती है/

 क्वायल -  गोल गोल तांबे के छल्ले लगे होते है/ इन  फ़िल्टर के लिए लगाया जाता है/


नार्थ ब्रिज -  मदरबोर्ड की सबसे  बड़ी चिप नार्थ चिप होती है/ जो  महत्वपूर्ण होती है/ जो  / इसका कार्य माइक्रोप्रोसेसर के डेटा को साउथ ब्रिज और A G P को डेटा लाने  जाने का  कार्य करती है/ A G P के रैम के आस पास मिलेगा/

कमांड देने पर इंस्ट्रक्शंस हार्ड-डिस्क पर जाएगा / हार्डडिस्क इंस्ट्रक्शंस आई डी  इ को देगा / आई डी इ  एफ एस बी के द्वारा नार्थ ब्रिज होते हुए  जायेगा /और प्रोसेसर उसे  जाएगा/ और डिस्प्ले कार्ड मॉनिटर  देगा /
















Sunday, 18 May 2014

Transistors

A Transistor (the construction of Transfer Resister) is an electric semiconductors (called electrode).  These are referred to as active component in contrast to “passive component” such as resistance or capacitors which ably have two electrodes (referred to as being “bipolor”).


A MOS (Metal Oxide Semiconductor) transistors is the most common type pof transistor used to designed integrated circuits MOS transistors have two negative charged area, respectively called sourced (which has almost zero charge) and drain (which has a 5v charge) separate by a positively charged region, called a substrate).  The substrate has a control electrode overlaid, called a gate that allows a charge to be applied to the substrate.

Wednesday, 14 May 2014

All signal of processor

Control Signal of Processor-  Control signal are electronic signals that orchestrate the various processor units participating in the execution of an instruction.  Central signals are sent using an element called a sequenced. For example read and write signal allows the memory to be told that the processor wants to read and write information.
Function Unit of Processor-  The processor the madeup of the group to interrelated units (or control  unit) Microprocessor architecture varies considerably from one design to another but the main elements of a microprocessor are as fallows.
                    A control unit that links the incoming data, decodes it, and sends it to the execution unit, the central unit is made up of the following elements.
Sequencer of Processor (or monitor and Logical Unit)-  That synchronize instruction execution with the clock speed .  It also sends control signals.
An execution Unit(or processing unit)-  That accomplish tasks assigned to it by the instructions unit.  The execution unit is made of the following elements.
The arithmetical and logical unit (written ALU).  The ALU perform basic arithmetical calculation and logic functions (And or Exclusive or etc).
The floating point unit (written FPU) that performs partial complex calculations which cannot be done by the arithmetical and logic unit.
Bus Management Unit-  That manage the flow of incoming and outgoing information and that interfaces with system RAM.


Cache Memory

 Cache Memory (also called buffer memory) is local memory that reduce waiting times for information stored in RAM (Random Access Memory).  In effect the computer’s main memory is slower than that of the processor.  There are however types of memory that are much faster, but which have a greatly increased cast.  The solution is greatly increased cost.  The solution is therefore to include the type of local memory close to the processor and to temporarily store to primary data to proceed in it, recent model computer have many different level of cache memory. 
Level Cache Memory-  This is directly integrated into the processor.  It is subdivided in to the two ports.
The first is the instructions cache which contains instructions from the RAM that have been decoded they came across the pipelines.
The second ports are data cache which contain daya from the RAM and data recently used during processor operations.
Level 1 cache memory canbe accessed very rapidly.  Access waiting time approach that are internal process registers.
Level 2 cache Memory (called L2 cache for L2 cache)-  This is located in the cache along with the processor(in the chip).  The level cac he2 is an intermediately between the processor, with its internal cache, and the RAM.  It can be accessed more rapidly than the level 1` cache.

Level 3 Cache Memory(called level 3 cache for Level 3 Cache)-   This is located on motherboard all these level of cache reduce the latency time of various memory type when processing as transferring information while the processor works the level one cache controller to transfer information without impeding the processor.  As well the level 2 cache interface with the RAM (Level three cache) to allow transfers without impeding normal processor.

Tuesday, 13 May 2014

Wednesday, 23 April 2014

Network Card

A network interface card (NIC) is a circuit board or card that is installed in a computer so that it can be connected to a network. 
A network interface card provides the computer with a dedicated, full-time connection to a network. Personal computers and workstations on a local area network (LAN) typically contain a network interface card specifically designed for the LAN transmission technology 

Tuesday, 22 April 2014

Input/Output Address

All computers have number of I/O devices attached to them such as printers, scanners, floppy drives, hard disks, and just about every other component you can think of Each of these devices requires a unique I/O
address.  An I/O address is the hexadecimal address of an area of memory that is used by the peripheral device to exchange information with other device in the system.  You can think of it as a kind of mail slot for the device.

I/O Address
Device
1F0-1F8
Hard disk Controller
200-207
Game I/O
278-27F
Parallel Port (LPT2)
2F8-2FF
Serial Port (COM2)
320-32F
Hard drive Controller,8 bit ISA
378-37F
Parallel Port (LPT1)
3B0-3BF
Monochrome Graffics Adapter
3D0-3DF
Color Graphics Adapter
3F0-3F7
Floppy Drive controller
3F8-3FF
Serial Port (COM1)

Not only does each component require an I/O address, but each component must use a unique I/O address.  This means that when a new device such as a network card or modem is installed in the system, I cannot be assigned an I/O address already being used by another device,  If two devices are assigned the same I/O address, one or both devices will fail to function. 

PORTS

Ports  refer to physical connector the system uses to communicate with other system devices.  Ports of this nature carry names such as COM1 or COM4,and are used by devices like the mouse or modem to communicate with the system.  Another port type, LPT  ports, can be used by printers to facilities  communication between the printer and the computer. 

BIOS

The BIOS Firmware is  stored in the complementary metal oxide semiconductor a special chip on the motherboard that holds the various BIOS settings.  These settings include things like the parameters for the hard disks, the boot order, and the status (either enabled or disabled) of on board devices.  Because BIOS is firmware.  It can be updated, though it requires a special program to achieve this,  The process of upgrading the BIOS is referred to as flashing.  The BIOS can be flashed to provide additional functionality or to correct a problem with the current version of the  BIOS.  The procedure for upgrading the BIOS is covered later in this chapter.

Firmware

Firmware is a program(Software) That is store on a chip(Hardware) but is not considered to be hardware and software.  In other words, it is between hardware and software--in between hard and soft comes firm.
The terms BIOS  and firmware have been used interchangeably and serve to confuse the issue. Firmware simply refers to the programs the are stored in chips and not on hard disks or other such devices.    

Thursday, 20 March 2014

Integrated Circuit

Integrated Circuits play a very important part in electronics. Most are specially made for a specific task and contain up to thousands of transistors, diodes and resistors. Special purposes IC's such as audio-amplifiers, FM radios, logic blocks, regulators and even a whole Micro Computer in the form of a micro controller can be fitted inside a tiny package.  
                                                     
                                                                   


Front Side Bus Or System Bus

The bus that connects the CPU to Main Memory on the Mother board. I/O buses, which connect the CPU with the systems other components, branch off of the system bus.
The system bus is also called the front side bus, memory bus, local bus, or host bus.