What should I do

Check if your hard drive is still in warranty period so you could ask for replacement from the manufacturer. Otherwise, simply buy a new hard drive and move all your data from the old one to the new drive.

SMART always predicts correct hard drive status and probably this time, you need to change it ASAP.

Hope it helps!!

You can buy a SATA dongle that plugs in to the hard drive and plugs into the USB port on you computer $20 or buy a external SATA case to put the hard drive in $40 at most computer retailers.

You do NOT need to buy a new Samsung disk-drive.
You can buy a replacement from Western Digital, or from Seagate/Maxtor, or any other manufacturer.

Take your current Samsung disk-drive to the computer-store, so that they can sell you a new disk-drive with IDENTICAL data/power connectors (either Parallel-ATA or SATA).

Hello
you dont need to buy new hard drive until you confirmed that your hard drive has no more, for the purpose you need check in CMOS setup, if it is detected by computer then there is a chance to re-use the hard disk, you just need to re-install windows, during installation format the hard disk after re-partition.
if this method fails then you need to buy new one, good luck
do rate the solution if got help

You can remove the disk-drive from the unit,
and then see: http://www.canadaram.com/3_5_sata_enclosures.htm
to buy a new enclosure, which will include a new power-cable,
and 'transplant' your disk-drive into the new unit,
to regain access to the files on your disk-drive.

I have a few questions for you first.1 did the new hard drive come with a disk,if so did you use it. 2 did you insert your recovery media into your drive and restart your computer

Will replacing the data-cable replace the broken-off piece?

If not, then for about $30, you can buy a new "empty" external case, and then "transplant" your current disk-space into the new case.
Take your current external drive to the computer-store, so that the new case that you buy will be the correct case for your existing disk-drive.

Of course, because you have a "small" (100GB) disk-drive, any warranty for the disk-drive probably has expired, and it would be good "preventative-maintenance" to buy a new external disk-drive, before your current disk-drive unexpectedly "quits" on you.

You cannot. The disk-drive has some "spare" sectors, and it should automatically reassign them, i.e., like using a spare tire on your car when one of the 4 tires goes flat, you just "swap-in" the "spare".

Unfortunately, unlike fixing a flat tire, there is no way to "repair" a bad sector on a disk.

Having "bad" sectors is a sign that your disk-drive is _SOON_ to _COMPLETELY_ fail. So, it's time for you to buy a new disk-drive, and copy all your files from your "old" disk to your "new" disk. Compare it to buying insurance for your automobile, in case of a "crash" while using your automobile (or your computer).

It's possible that your computer's motherboard is "old", and it only supports a maximum of 32GB per disk-drive.

Buy a new 80GB or 160GB disk-drive, and copy all your files from the "old" disk to the "new" disk.

if the hard disk fails better to buy new hard disk.