Help :which program isolate bad sector permanently?

[hepa]

Hello
i have a 1.5 Tb seagate disk (NTFS format)
when i check with crystal disk info it notices me reallocate sector count (12/36)

i still want to use this hdd for a short time more ,and i have some problems which i'm not sure about ,please help :

1. when i copying the data from this disk to other hdd ,i wonder is it needed to isolate/mark the bad sector (without formatting/recreating partition the disk ),
so that we can protect the bad data copied/writed (in my case the reallocate sector count has not reached thresold,is it needed ?)

2. is there anyway to know if the data is on the bad sector - when copying ,accessing ? (is there any error noticed ? )

3. i read some similar topic and found hdat2 and windows check disk tools ,but i'm not sure if them can isolate/mark the bad sector permanently
(such as when we format the disk,is the marked bad sector still isolated/marked ? (not included new bad sectors appear after scanning)
if using windows check disk tool ,should we use which ?
1. use tool=> option =>check disk
or use CHKDSK [drive letter] /F /R (i don't know if "/f/r" it's correct in my case ,please tell me which i should type in this case for best result
thank you

4. please tell me which program can isolate/mark the bad sector faster (if you know any better tool ,please tell me)
Thank you very much

[sathyan]

If you want data from the drive, do not try software tools directly to the drive.
Make a clone of the drive and run recovery tools on the clone.

After you have recovered all the data , you can test the condition of the drive using MHDD and decide if you can use it or not.

If your data is important , take pro help.
Do not run tools like chkdsk on drives(which have data) with badsectors