La séance de questions et réponses d’aujourd’hui nous est offerte par SuperUser, une sous-division de Stack Exchange, un groupe de sites Web de questions-réponses dirigé par la communauté.
La question
Le lecteur de superutilisateur P_Q est curieux des systèmes de fichiers, écrit-il:
I have used Windows since childhood, and when I hear the phrase “Windows files system” I think of directories (folders) within directories, a folder called SYSTEM, a folder called PROGRAM FILES, etc. Is this what the system is? Just the layout of the folders?
And then I recently started using Linux, and my reference book says in the Linux filesystem everything starts at root and branches off from there. How is that really different from Windows? I mean, it seems the Linux system and the Windows system are just two ways of setting up a directory tree. Is this what file system means?
Est-ce que cette simple prise sur le système de fichiers est le moyen le plus précis de le décrire? Creusons un peu plus loin.
La réponse
Tom Wijsman, contributeur au SuperUser, offre un aperçu perspicace de la structure des systèmes de fichiers sous Windows et Linux. Il écrit:
Just the layout of the folders?
Sounds too good to be true…
Let’s take the FAT32 file system as an example. I can install Windows XP on it, but I can also use it on a memory card. On a memory card, you don’t have those folders that you sum up.
So… Don’t confuse the directory layout of a family of operating systems with a file system.
Is this what a file system means?
No… It refers to the underlying bits and bytes that make your directory structure work.
The underlying bits and bytes? Show me FAT32!
Let’s look at what FAT32 looks like, it has:
- Some header sectors in the beginning, like Volume ID and Reserved Sectors
- Two File Allocation Tables, allowing us to figure out where our files are.
- Clusters containing all our directory and file data.
- Some very small unused space that we can’t use.
A directory entry would point to a list of directory/file entries…
Do other file systems differ? Show me NTFS!
I’m going to show you an image so you can notice the differences, the rest is homework for the reader: More information can be found on this blog archive or Google.
The main idea is that NTFS is a huge improvement over FAT32 that is more robust/efficient. Having a better idea of (un)used space by using a bitmap to further help against fragmentation. And so on…
What about the file systems on Linux? Show me ext2/3!
The idea is that ext2/ext3 use super blocks and inodes; this allows for soft and hardlinks, directories that are files, files with multiple names and so on. The main gist is abstracting away to allow the file system to be capable of doing more meta-ish stuff…
Pour plus de lecture sur les systèmes de fichiers, assurez-vous de consulter les articles How-To Geek suivants:
- HTG explique: la structure du répertoire Linux est expliquée
- HTG explique: Quel système de fichiers Linux devriez-vous choisir?
- Quel système de fichiers dois-je utiliser pour mon lecteur USB?
Avez-vous quelque chose à ajouter à l'explication? Sound off dans les commentaires. Voulez-vous lire plus de réponses d'autres utilisateurs de Stack Exchange doués en technologie? Découvrez le fil de discussion complet ici.