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datarecovery:safecopy [2016/08/18 07:44] – created niziakdatarecovery:safecopy [2016/08/20 10:42] (current) – [stage#.badblocks files] niziak
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 ====== safecopy ====== ====== safecopy ======
 There are some predefined settings: There are some predefined settings:
-  * **stage1**: Preset to rescue most of the data fast,  using  no  retries  and avoiding bad areas. Skip 10% of size when bad block found. 1 read attempt. +  * **stage1**: Preset to rescue most of the data fast,  using  no  retries  and **avoiding bad areas**. Skip 10% of size when bad block found. 1 read attempt. 
-  * **stage2**: Preset to rescue more data, using no retries but  searching  for exact ends of bad areas. Skip 128 blocks when bad block found. 1 read attempt.+  * **stage2**: Preset to rescue more data, using no retries but  searching  for **exact ends of bad areas**. Skip 128 blocks when bad block found. 1 read attempt.
   * **stage3**: Preset to rescue everything that can be  rescued  using  maximum retries, head realignment tricks and low level access. Skip 1 block if bad block found. 4 read attempts.   * **stage3**: Preset to rescue everything that can be  rescued  using  maximum retries, head realignment tricks and low level access. Skip 1 block if bad block found. 4 read attempts.
  
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 | stage2 | 128* |  1*        |  1    |  0        |  2        | stage1.badblocks | stage2.badblocks   | | | stage2 | 128* |  1*        |  1    |  0        |  2        | stage1.badblocks | stage2.badblocks   | |
 | stage3 | 1*   |  1*        |  4    |  1        |  2        | stage2.badblocks | stage3.badblocks   | | | stage3 | 1*   |  1*        |  4    |  1        |  2        | stage2.badblocks | stage3.badblocks   | |
 +
 +Every ''stage'' preset parameter can be overridden.
 +E.g. for stage 3 is not needed to give additional stress to device with -R 4 and -Z 1, and better is to use:
 +<code bash>safecopy --forceopen -L 0 --stage3 -c 151275030 -Z 0 -R 1 /dev/sdb /dev/sdc</code>\\
 +****Note:** ''-c'' parameter is used to continue previous ''safecopy'' interrupted by CTRL+C.\\
 +Note:** With ''-f'' parameter other than 1* you can  miss  good areas in between two bad ones.
  
 ===== stage#.badblocks files ===== ===== stage#.badblocks files =====
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 Unrecoverable bad blocks (bytes): 60 (18100224) Unrecoverable bad blocks (bytes): 60 (18100224)
 Blocks (bytes) copied: 151299151 (619721322496)  Blocks (bytes) copied: 151299151 (619721322496) 
 +</code>
 +
 +Number of lines in each ''stage#.badblocks'' file shows how each stage works:
 +<code bash>
 +# cat stage1.badblocks | sort | uniq | wc -l
 +51200
 +# cat stage2.badblocks | sort | uniq | wc -l
 +4720
 +# cat stage3.badblocks | sort | uniq | wc -l
 +1477
 </code> </code>
 ===== Usage example ===== ===== Usage example =====
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 ===== Output ===== ===== Output =====
 <code> <code>
-......................................... [243958862] 
-......................................... [244000846] 
 ......................................... [244042830] ......................................... [244042830]
 ......................................... [244084814] ......................................... [244084814]
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 .[151274323](+16384){XXX<<<<<<<}[151274620](+1216512) .[151274323](+16384){XXX<<<<<<<}[151274620](+1216512)
 .[151274700](+327680){X<<<<<<<}[151274788](+360448) .[151274700](+327680){X<<<<<<<}[151274788](+360448)
-.[151274789](+4096){XXXX<<<<<<<}[151275196](+1667072) 
-.[151275198](+8192){X<<<<<<<}[151275203](+20480) 
-.[151275238](+143360){X<<<<<<<}[151275280](+172032) 
-.[151275345](+266240){XX<<<<<<<}[151275573](+933888) 
-.[151275575](+8192){X<<<<<<<}[151275580](+20480) 
-.[151275582](+8192){X<<<<<<<}[151275601](+77824) 
-.[151275603](+8192){XX<<<<<<<}[151275793](+778240) 
 .[151275798](+20480){XXX<<<<<<<}[151276078](+1146880) .[151275798](+20480){XXX<<<<<<<}[151276078](+1146880)
 .[151276107](+118784){X<<<<<<<}[151276110](+12288) .[151276107](+118784){X<<<<<<<}[151276110](+12288)
Line 97: Line 104:
 ..[151278398](+7725056){XXXX<<<<<<<}[151278843](+1822720) ..[151278398](+7725056){XXXX<<<<<<<}[151278843](+1822720)
 .[151278847](+16384){XX<<<<<<<}[151279033](+761856) .[151278847](+16384){XX<<<<<<<}[151279033](+761856)
-.[151279034](+4096){X<<<<<<<}[151279043](+36864) 
-.[151279048](+20480){X<<<<<<<}[151279049](+4096) 
-.[151279058](+36864){X<<<<<<<}[151279160](+417792) 
-.[151279166](+24576){X<<<<<<<}[151279170](+16384) 
 .[151279172](+8192){X<<<<<<<}[151279173](+4096) .[151279172](+8192){X<<<<<<<}[151279173](+4096)
 .[151279178](+20480){X<<<<<<<}[151279179](+4096) .[151279178](+20480){X<<<<<<<}[151279179](+4096)
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 .[151279646](+24576){X<<<<<<<}[151279684](+155648) .[151279646](+24576){X<<<<<<<}[151279684](+155648)
 .[151279685](+4096){XXX<<<<<<<}[151280013](+1343488) .[151279685](+4096){XXX<<<<<<<}[151280013](+1343488)
-.[151280014](+4096){X<<<<<<<}[151280023](+36864) 
-.[151280032](+36864){X<<<<<<<}[151280141](+446464) 
-.[151280145](+16384){X<<<<<<<}[151280155](+40960) 
-.[151280221](+270336){X<<<<<<<}[151280335](+466944) 
-.[151280410](+307200){X<<<<<<<}[151280471](+249856) 
 .[151280572](+413696){X<<<<<<<}[151280636](+262144) .[151280572](+413696){X<<<<<<<}[151280636](+262144)
 .[151280638](+8192){XX<<<<<<<}[151280812](+712704) .[151280638](+8192){XX<<<<<<<}[151280812](+712704)
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 Blocks (bytes) copied: 244190646 (1000204886016) Blocks (bytes) copied: 244190646 (1000204886016)
 </code> </code>
 +
  
 ===== Continue interrupted copy ===== ===== Continue interrupted copy =====