format - Formatting an external HDD stuck at 70%

My external HDD which is a 250GB WD (powered by USB) seems to have problem! Whenever i try to copy some files, it stuck while copying. I decided to format it. So I used windows tool and performed the format (not quickly) however at nearly 70% it stuck.

Then I decided to perform a low level format with lowlevel. Again it stuck at 70%.

I endup that the HDD has bad sector. So is there any tool that mark the bad sectors and bypass them? It is not very reasonable to through 250GB because of some bad sectors!

P.S: I saw a similar topic but there were no conclusion there either. The smart data is

Attribute,         raw value, value, threshold, status
Read Error Rate,       50,     200,    51,        OK
Spin-Up Time,         3275,    154,    21,        OK
Start/Stop Count,     2729,     98,     0,        OK
Reallocated Sectors Count,0,    200,    140,      OK
Seek Error Rate,        0,      100,    51,       OK
Power-On Hours (POH),  1057,     99,     0,       OK
Spin Retry Count,       0,     100,     51,       OK
Recalibration Retries  ,0,     100,     51 ,      OK
Power Cycle Count,    1385,    99,      0,        OK
Power-off Retract Count, 425,   200,    0,        OK
Load /Unload Cycle Count,12974, 196,     0,       OK
Temperature,          43,       43,     0,        OK
Reallocation Event Count,0,    200,      0,       OK
Current Pending Sector Count,23,200,    0,      Degradation
Uncorrectable Sector Count, 0,  100,    0,        OK
UltraDMA CRC Error Count,6,   200,      0,        OK
Write Error Rate/Multi-Zone Error Rate,0,100,51,  OK

It seems that the most important thing is this line

Current Pending Sector Count,23,200,    0,      Degradation

Any idea on that?