Operating Systems

defrag/Defragment

Computer virus or of various types and signatures. In general whenever your computer behaves abnormally than it is said that your computer has virus. Operating System: Windows can be considered as a Synonym for OS and in particular Windows OS is stored in ur C drive. In C drive u have program files; which have all ur OS stuff. Virus: Any download from net or any attachment in ur mail or if u have copied any file from ur memory stick can have a auto run program which needs a trigger. Trigger can be anything; it can be when u clicked the .exe file or u opened the attachment. the address mentioned in that virus will be something like \\C:Program files\win 32 this is sufficient to ruin ur OS; once win 32 is infected ur OS will do rock and roll I hope above information was relevant. thanks sahil

Role of the Memory management unit in Operating system Every program for its execution requires some space in computer memory which is provided by memory management unit using virtual memory that provides the external storage addressing location for the programs that does not have too much space in main memory for their execution and saved them in secondary memory but when required loaded them again in main memory. This deallocation and reallocation of programs in main memory deals with concurrency. At last, we say that loading capabilities of programs with the memory addressing is there in it.

The number of bits is determined by the processor. Early microprocessors were 4 or 8 bit; the machine instructions were essentially 4 or 8 bits wide and the processor performed arithmatic in 4 or 8 bit "chunks". Later processors used 16, 32 or 64 bits and advanced processors can switch between different "modes" of operation. The principle advantage of more bits is that more memory can be addressed, arithmatic operations can deal with bigger numbers and instructions can be more "complicated". However, to make use of the different processor sizes, the operating system must be designed to use the bigger processors; most versions of Windows are 32 bit - the operating system software is compiled for use on 32 bit processors. Microsoft also sell 64 bit versions of Windows which are compiled for 64 bit processors.

In addition to employee and family social events, sales contests and other morale building activities, Sun Design practices "open-book management," regularly providing employees with company financial data and other information so they can understand their work in the context of the whole organization.

There is not a native equivalent on Mac OS, but you could try Paintbrush, it is free.

There are several examples of operating systems available. The most popular and widely used operating systems are Microsoft Windows, Apple macOS, Linux, and Google's Android. These operating systems are used by millions of people around the world.

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Operating system is the system which bridge the gap between the computer user and hardware peripherals. It also associate all the hardwares properly. OS acts as the nervous system in the human body.

To learn how an operating system performs its duties is to garner insight into how a computer functions at its innermost levels. This leads to insight on how to write device drivers (for example, hardware manufacturers would benefit from this type of study), how to write applications with improved performance and stability, or even how to write an operating system of your own (maybe for some special hardware you created, or whatever other reason one could think of).

Do you want a software to collect the computer‘s hardware information from LAN ？

An operating system loads via the memory of a computer. The specific area that gets the operating system to load is called the boot loader.

As of September 2009, the most common desktop operating system is Windows XP, with about 70% of the market share. Next is Windows Vista, with 18% of the market share. Mac OS X 10.5 is next with 3% of the market share. Windows 7 has 1.5% of the market share. Mac OS X 10.4 has about 1% and is virtually tied with Linux.

Insertion point

cursor

1. Null Pointer

2. Memory Fault

3. Segmentation Fault

4. Neverending loop

5. Computer waits for a response but the program uses a void function for the return.

6. Never responds

7. Program Designed to terminate automatically when it is ran.

8. Array is outside of boundaries

9. Process was Modified and cannot operate.

10. Error Occurs that the proccess cannot handle and exits.

Burst time is an assumption of how long a process requires the CPU between I/O waits.It can not be predicted exactly, before a process starts.

It means the amount of time a process uses the CPU for a single time. (A process can use the CPU several times before complete the job)

Multitasking.

A 64-bit OS (in concert with a 64-bit processor) will be able to run 64-bit applications (applications written to take advantage of 64-bit OS's & CPU's)

The catch is, there arent any 64-bit applications on the market as yet, so you arent likely to see any advantage until such time as one is released.

Having a 64-bit OS would also mean you would be able to fit up to 16GB RAM memory that would be recognized by Windows XP/Vista.

By far the greatest potential advantage of a 64 bit OS is the vastly increased virtual address space. In 32 bit Windows all processes have a private 2GB virtual address space. This is totally independent of RAM size. In 64 bit Windows, when running native 64 bit applications, this address space increases to 8192GB, again totally independent of RAM size. For applications using large databases, video editing, etc., this is a MAJOR advantage, even if you have only 4GB RAM.

Another advantage is the ability access more RAM. In some server editions this may be as high as 2048GB. That is larger than what is currently commercially available.

Answer: Recall that paging is implemented by breaking up an address into a page and offset number. It is most efficient to break the address into X page bits and Y offset bits, rather than perform arithmetic on the address to calculate the page number and offset. Because each bit position represents a power of 2, splitting an address between bits results in a page size that is a power of 2.

An operating system is just like any other piece of software: none is perfect. Because of this, many attempts are being made to create the "best" one available.

Several operating systems are capable of functioning in a distributed manner, including Linux, FreeBSD, Solaris, and Mac OS X.