---
name: "unrm"
section: "1"
platform: "linux"
package: "tct"
version: "1.19-1"
release: "Debian 6.0 (Squeeze)"
platforms: ["linux"]
url: "https://new.carta.tech/unrm"
---

# unrm(1)

disk data recovery

## NAME

unrm - disk data recovery

## SYNOPSIS

```

```

**unrm** \[**-bevV**\] \[**-f** *fstype*\] *device* \[*start-stop* ...\]

## DESCRIPTION

**unrm** opens the named *device* and copies data blocks. By default, **unrm** copies unallocated data blocks only.

Arguments:

- **-b**

  With file systems that have logical blocks that consist of fragments, don't insert null-byte padding to preserve logical block alignment in the output. This option is a no-op with the LINUX ext2fs file system, where logical blocks and fragments have the same size.

- **-e**

  Copy every block. The output should be similar to [dd(1)](/dd/1.md).

- **-f** *fstype*

  Specifies the file system type. The default file system type is system dependent. With most UNIX systems the default type is **ufs** (Berkeley fast file system). With Linux the default type is **ext2fs** (second extended file system).

- **-v**

  Turn on verbose mode, output to stderr.

- **-V**

  Turn on verbose mode, output to stdout.

- *device*

  Disk special file, or regular file containing a disk image. On UNIX systems, raw mode disk access may give better performance than block mode disk access.  LINUX disk device drivers support only block mode disk access.

- *start-stop* ...

  Examine the specified block number or number range. Either the *start*, the *stop*, or the *-stop* may be omitted. If **-b** is not specified, the start block must be aligned to a logical block boundary (e.g. a multiple of 8 in the case of an FFS file system). With the LINUX ext2fs file system, the start block number must be \>= 1.

## BUGS

**unrm** should support more file system types. Right now, support is limited to **ext2fs** when built on Linux, and **ufs** when built on Solaris and BSD systems.

## LICENSE

```
This software is distributed under the IBM Public License.
```

## AUTHOR(S)

```
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
```