Resize RaspberryPi.img file

This article describes how to truncate oversized .img file

Command (on linux):

# truncate -s 4000M RSE1g.img<br></p><h1>Check file size:</h1><p>ls -l --block-size=M<br></p><h1>Make a copy of the file</h1><p>cp old.img new.img

 

Truncate command references

NAME

truncate – shrink or extend the size of a file to the specified size

SYNOPSIS

truncate OPTIONFILE

DESCRIPTION

Shrink or extend the size of each FILE to the specified size

A FILE argument that does not exist is created.

If a FILE is larger than the specified size, the extra data is lost.

If a FILE is shorter, it is extended and the extended part (hole) reads as zero bytes.

Mandatory arguments to long options are mandatory for short options too.

-c, –no-create

do not create any files

-o, –io-blocks

treat SIZE as number of IO blocks instead of bytes

-r, –reference=RFILE

base size on RFILE

-s, –size=SIZE

set or adjust the file size by SIZE bytes

–help display this help and exit

–version

output version information and exit

The SIZE argument is an integer and optional unit (example: 10K is

10*1024). Units are K,M,G,T,P,E,Z,Y (powers of 1024) or KB,MB,…

(powers of 1000).

SIZE may also be prefixed by one of the following modifying

characters: ‘+’ extend by, ‘-‘ reduce by, ‘<‘ at most, ‘>’ at least,

‘/’ round down to multiple of, ‘%’ round up to multiple of.

Changing size of the partitions on .img file

Before .img file can be truncated, make sure, that the partitions fit on the resized file.

Use GParted to resize the partitions.

References:

[1] http://www.htpcguides.com/easy-resize-and-back-up-raspberry-pi-sd-card-with-ubuntu/
[2] http://blog.gbaman.info/?p=328

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