Loss of data during resizing partition ?

[Fabio Marconi]

Hello
Performing an installation of Oneiric amd64 desktop, choosing manual partitioning, I've resized /dev/sda3 containing few data, and at the end of the operation the size of the used space was reduced (look screenshot 1), I decided to try again and i reduce again this partition and the used space was reduced again (screenshot 2)

Dimensione = Dimension
Utilizzato = Used
Spazio libero = Free space

In the screenshot 1 we can see the 'Utilizzato' measuring 18768 MB, but after reduction of /dev/sda3 it now measure 18610 MB (screenshot 2)

Thanks
Fabio

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: ubiquity 2.8.7
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Uname: Linux 3.0.0-12-generic x86_64
ApportVersion: 1.23-0ubuntu3
Architecture: amd64
CasperVersion: 1.287
Date: Fri Dec 9 13:43:34 2011
LiveMediaBuild: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcEnviron:
 PATH=(custom, no user)
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: ubiquity
UpgradeStatus: No upgrade log present (probably fresh install)

[Daniel Manrique (roadmr)]

The filesystem needs some space for its data structures. This may account for the difference in used space (i.e. if the filesystem is resized, less space is needed to keep track of things).

One way to ascertain it, if possible, would be to re-resize the disk to the previous value (i.e. enlarge it), and seeing whether the "used space" count goes back to what you had before.

What do other tools (for instance, "du -h" in a terminal) say about the used space?

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