how do i test if my hard drive is damaged directly from boot?

vikyy17

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Oct 8, 2015
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a few days back the windows 8 OS in my laptop got crashed without me or anyone messing with any windows files. so i ran windows setup from a bootable USB. it was going good for a few minutes and eventually ended with an error. tried different versions of windows still it didn't work. it was then i visited a nearby lenovo service center. when i told my problem they quickly inserted a cd and ran a test from boot. in a few minutes they said my hard drive is dead and has to be replaced. what test would they have done to figure out the errors in HDD. can you please explain