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uetchy
2018-08-03 14:06:51 +09:00
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_posts/2018-02-15-data-recovery.markdown
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@@ -10,14 +10,17 @@ Suppose you are using macOS and your endangered disk is formatted with HFS+.
# Beforehand
## Inspect
Use `diskutil list` to verify that which drive is damaged.
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
To prevent extra load, unmount the damaged disk: `diskutil unmountDisk disk2`.
# Rescue
If you never been `ddrescue`, `brew install ddrescue` to install them on your machine.
```bash
@@ -27,7 +30,7 @@ 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`.
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.
@@ -45,4 +48,4 @@ And `/dev/disk2s2` become `/dev/rdisk2s2` this time. `r` stand for raw so this w
# Aftercare
Mount `hdimage.dmg` and copy files and directories to a new drive. If the image is broken, you can recover it using `testdisk`.
Mount `hdimage.dmg` and copy files and directories to a new drive. If the image is broken, you can recover it using `testdisk`.