leafee98-blog/content/essays/free-space-less-than-actual.md

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---
title: "ext4 格式化以后有意料外的已用空间"
date: 2021-03-25T12:09:43+08:00
tags: []
categories: []
weight: 50
show_comments: true
draft: false
---
ext2/3 中格式化文件系统以后,会预留 5% 的空间,以便在空间耗尽以后,仍然可以保证系统的正常启动,允许系统管理员对系统进行维护。
对于纯粹的存储用硬盘,这种预留不是必需的。
[https://superuser.com/questions/575756/wrong-free-space-reported-for-an-ext4-formatted-3tb-drive](https://superuser.com/questions/575756/wrong-free-space-reported-for-an-ext4-formatted-3tb-drive)