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Tuesday 19 March 2013

WILL WINDOWS WORK CONTINUOUSLY FOR MORE THAN 49.7 DAYS?


Here is a bit of information, which may surprise you all.Windows crashes automatically if you don't switch off the machine for 49.7 days.Microsoft accept this do you know this why?
In windows the virtual machine manager(VMM) is responsible for creation, execution,monitoring and termination of virtual machines.This VMM, which is a 32 bit, protected mode operating systems entity,provides a number of system services at chip level.One of the services is "Get-System-Time".

 Register with the time in milliseconds since windows started on that machine.This services is accurate to 1 ms. EAX is a 32 bit register in Intel 386 processor on wards.
So the maximum number of milliseconds it can hold is (232)-1=4294967.295 seconds=71582.79 minutes=1193 hours=49.7 days. So after 49.7 days the EAX reset to zero.Most of the drivers use this time services to keep track of the timeout of various services they provide. So after 49.7 days the drivers cannot use the get-system-time function of VMM and they taking the operating system along with.

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