---
name: "newfs_udf"
section: "8"
platform: "linux"
package: "udfclient"
version: "0.8.11-2"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/newfs_udf"
---

# newfs\_udf(8)

construct a new UDF file system

## NAME

**newfs\_udf** – construct a new UDF file system

## SYNOPSIS

**newfs\_udf** \[**-cFM**\] \[**-B** *blockingsize*\] \[**-L** *loglabel*\] \[**-P** *discid*\] \[**-p** *percentage*\] \[**-S** *sectorsize*\] \[**-s** *size*\] \[**-t** *gmtoff*\] \[**-V** *max\_udf*\] \[**-v** *min\_udf*\] *special*

## DESCRIPTION

The **newfs\_udf** utility creates an UDF file system on device *special* suitable for the media currently inserted.

The options are as follow:

- **-B** *blockingsize*

  When creating image files, specify the blocking size or packetsize of the media to *blockingsize*.

- **-c**

  Perform a crude surface check first to weed out disc faults on rewritable media.

- **-F**

  Force file system construction on non-empty recordable media or create an image file.

- **-L** *loglabel*

  Set the disc logical label to the specified *loglabel*.

- **-M**

  Disable metadata partition creation when selected UDF version or media dictates this. For strict conformance and interchange, don't disable this unless its causing problems.

- **-P** *discid*

  Set the physical disc label to the specified *discid*.

  Prepend *discid* with volsetname separated with a ':' if wanted. For strict conformance and interchange, don't set this manually unless it has a unique hex number in the first 8 character positions.

- **-p** *percentage*

  Percentage of partition to be initially reserved for metadata on the Metadata partition. It defaults to 20 %.

- **-S** *sectorsize*

  Set the sectorsize for image files. For strict conformance and interchange, don't set this manually.

- **-s** *size*

  For image files, set the file size to the humanized size *size*.

- **-t** *gmtoff*

  Use the specified *gmtoff* as gmt time offset for recording times on the disc.

- **-V** *max\_udf*

  Select *max\_udf* as the maximum UDF version to be supported. For UDF version 2.50, use “0x250” or “2.50”.

- **-v** *min\_udf*

  Select *min\_udf* as the minimum UDF version to be supported. For UDF version 2.01, use “0x201” or “2.01”.

## NOTES

The UDF file system is defined for the entire optical medium. It can only function on the entire CD/DVD/BD so the raw partition has to be specified for read/write actions. For **newfs\_udf** this means specifying the raw device with the raw partition, i.e. */dev/rcd0d* or */dev/rcd0c*.

Some rewritable optical media needs to be formatted first before it can be used by UDF. This can be done using mmcformat(8).

The default UDF version is version 2.01.

## EXAMPLES

Create a file system, using the specified names on the device */dev/rcd0d* with the default UDF version :

```
newfs_udf -P "Encyclopedia:copy-nr-1" -L "volume 2" /dev/rcd0d
```

Create a 4.8 GiB sparse file and configure it using [vnconfig(8)](/vnconfig/8.md) to be a 2048 sector size disc and create a new UDF file system on */dev/rvnd0d* :

```
dd if=/dev/zero of=bigdisk.2048.udf seek=9999999 count=1
vnconfig -c vnd0 bigdisk.2048.udf 2048/1/1/1
newfs_udf -L bigdisk /dev/rvnd0d
```

Create a 2 GiB file and create a new UDF file system on it using the default 512 byte sector size :

```
newfs_udf -L bigdisk2 -F -s 2G bigdisk2.iso
```

Create a 200 MiB file and create a new UDF file system on it using a sector size of 2048 :

```
newfs_udf -L bigdisk2 -F -s 200M -S 2048 bigdisk3.iso
```

Create a new UDF file system on the inserted USB stick using its native sectorsize of 512 :

```
newfs_udf -L "My USB stick" /dev/rsd0d
```

## SEE ALSO

[disktab(5)](/disktab/5.md), [disklabel(8)](/disklabel/8.md), mmcformat(8), [newfs(8)](/newfs/8.md)

## HISTORY

The **newfs\_udf** command first appeared in NetBSD 5.0.

## AUTHORS

Reinoud Zandijk ⟨*reinoud@NetBSD.org*⟩

## BUGS

The *P* and the *S* arguments have changed meaning. The meaning of *S* has been merged into *P* since NetBSD 6.1.