Windows 7 - Hard Drive Issue - "Reallocated Sectors Count"

Hi.
I'm Harsha.

I have a Sony Vaio laptop (Model - VPCEB26FG)
Recently, it fell off a table, and when I restarted it, it wasn't loading windows and I realized it was a Hard disk crash.

So I gave it for replacement at the authorized service centre, they put in a new Hard drive and returned it to me today.

Now I installed windows 7 Home Premium 64 bit, and fedora15.

It says "Hard disk is failing" and says that there are 237 bad sectors under "Reallocated Sectors Count"

Q1. Does this mean this is yet another hard disk failure ? If so, why do you think it happened , I haven't dropped it or anything as such.

Q2. Did the previous drop have some effect on internal circuitry and is that affecting my new Hard drive too ? What is the cure for such a problem ?

Why don't you run a chkdsk and see what it finds..and or fixes if anything. I don't know much about your bios but I wonder if it is harboring some info from the last hard drive I don't know..

I ran chkdsk. It didn't fix anything

To be more precise about the problem details :
It says:
Normalized value : 100
Worst : 100
Threshold : 50
Value : 237 sectors

Just today it started showing one more error in
"Current Pending Sector Count"

Normalized Value : 100
Worst : 100
Threshold : 0
Value : 1 sector


I guess the sony people replaced mine with a second hand hard disk
because I was told the "Current Pending Sector Count" error is a sign of old age.

And I want to know if a previous hard disk crash could have any role in subsequent hard disk crashes, and if yes, how ?

Please reply someone

Thanks