1 files changed, 48 insertions, 0 deletions
diff --git a/00_blog/00015_Admin/00030_Fixing-HDD/index.md b/00_blog/00015_Admin/00030_Fixing-HDD/index.md
new file mode 100644
index 0000000..0bae730
--- /dev/null
+++ b/00_blog/00015_Admin/00030_Fixing-HDD/index.md
@@ -0,0 +1,48 @@
+# 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