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# Fixing HDD after Free Falling
So you also dropped your hard-disk and some of your secotrs got damaged,
probably by the head hitting the platter?
Backup all your data.
## smartctl
Try from fastest to slowest to find faulty sector: replace LBAi\_START,LBA\_END with meaningful values.
smartctl -t [long|conveyence|short|select,LBA_START-LBA_END] -C /dev/sda
## hdparm
Bi-search via –read-sector if complete ranges are affected (as in my case) and then fix them in one step:
for i in {36312851..36312886}; do hdparm --write-sector $i /dev/sda; done
## Example
Exemplary session fixing one sector:
**WARNING: this will destroy your data !**
1) # smartctl -a /dev/sda | egrep 'Pend|Real|Offline_Unc'
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 4
197 Current_Pending_Sector 0x0012 098 098 000 Old_age Always - 47
198 Offline_Uncorrectable 0x0010 098 098 000 Old_age Offline - 47
2) # smartctl -t short /dev/sda
3) # smartctl -l selftest /dev/sda
[...] 1 Short offline Completed: read failure 90% 10632 152076520
4) # hdparm --read-sector 152076520 /dev/sda # verification
[...] reading sector 152076520: FAILED: Input/output error
5) # hdparm --write-sector 152076520 /dev/sda
6) # smartctl -a /dev/sda | egrep 'Pend|Real|Offline_Unc'
5 Reallocated_Sector_Ct 0x0033 100 100 036 Pre-fail Always - 4
197 Current_Pending_Sector 0x0012 098 098 000 Old_age Always - 46
198 Offline_Uncorrectable 0x0010 098 098 000 Old_age Offline - 46
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