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Updated Data Recovery

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uetchy 2018-02-15 13:34:31 +09:00 committed by Siteleaf
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_posts/2018-02-15-data-recovery.markdown
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@ -11,7 +11,8 @@ Suppose you are using macOS and your endangered disk is formatted with HFS+.
## Inspect ## Inspect
Use `diskutil list` to verify that which drive is damaged. Use `diskutil list` to verify that which drive is damaged.
This article assumes that `disk2` is the damaged one AND a partition `disk2s2` is what you expected to be rescued. You don't want to save `disk2s1` that is usually EFI partition.
This article assumes that `disk2` is the damaged AND a partition `disk2s2` is what you expected to be rescued. You don't want to save `disk2s1` that is usually EFI partition.
## Damage Control ## Damage Control
To prevent extra load, unmount the damaged disk: `diskutil unmountDisk disk2`. To prevent extra load, unmount the damaged disk: `diskutil unmountDisk disk2`.
@ -25,7 +26,9 @@ sudo ddrescue -n -v /dev/disk2s2 ./hdimage.dmg ./mapfile
``` ```
So this command will start rescuing your data from `/dev/disk2s2` partition to `hdimage.dmg` while writing log to `mapfile`. So this command will start rescuing your data from `/dev/disk2s2` partition to `hdimage.dmg` while writing log to `mapfile`.
You might want to rescue data as fast as possible. option `-n` is here for. This will skip scraping phase that causes aggressive disk access. You might want to rescue data as fast as possible. option `-n` is here for. This will skip scraping phase that causes aggressive disk access.
Option `-v` stand for verbose logging. Option `-v` stand for verbose logging.
```bash ```bash
@ -33,8 +36,11 @@ sudo ddrescue -r5 -v /dev/rdisk2s2 ./hdimage.dmg ./mapfile
``` ```
When the first command completed, do it again with different parameters to aggressively scrape bad area failed to access the first time. When the first command completed, do it again with different parameters to aggressively scrape bad area failed to access the first time.
Option `-r5` means ddrescue will try rescuing damaged area for 5 times. Option `-r5` means ddrescue will try rescuing damaged area for 5 times.
And `/dev/disk2s2` become `/dev/__r__disk2s2` this time. `r` stand for raw so this will access the disk more direct way. And `/dev/disk2s2` become `/dev/__r__disk2s2` this time. `r` stand for raw so this will access the disk more direct way.
> Beware: You MUST use same `hdimage.dmg` and `mapfile` between two commands. `mapfile` remembers which blocks were rescued and vise versa. > Beware: You MUST use same `hdimage.dmg` and `mapfile` between two commands. `mapfile` remembers which blocks were rescued and vise versa.
# Aftercare # Aftercare