在 Cydia 上搜索應用進行安裝，提示錯誤：failed to write (No space left on device)，從字面上的意思看是磁盤空間不夠，導致寫入錯誤，但是到 “關於” 里看到磁盤可用空間還剩 8.3G。嘗試將 deb 包上傳到手機，使用命令手動安裝，還是提示相應的錯誤，信息如下：
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# dpkg -i eXfaker.deb
Selecting previously unselected package net.exchen.exfaker.
(Reading database ... 4236 files and directories currently installed.)
Preparing to unpack eXfaker.deb ...
Unpacking net.exchen.exfaker (1.2.5) ...
dpkg: error processing archive eXfaker.deb (--install):
cannot copy extracted data for './Applications/eXfaker.app/eXfaker' to '/Applications/eXfaker.app/eXfaker.dpkg-new': failed to write (No space left on device)
dpkg-deb: error: subprocess paste was killed by signal (Broken pipe: 13)
Errors were encountered while processing:
eXfaker.deb
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使用 df -h 命令查看磁盤的情況，發現原來文件系統 /dev/disk0s1s1 的掛載點是 / 目錄，可用空間果然是沒有了，而 /dev/disk0s1s2 的掛載點是 /private/var 目錄，可用空間還剩 8.3 G，信息如下：
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# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/disk0s1s1 2.6G 2.6G 0 100% /
devfs 28K 28K 0 100% /dev
/dev/disk0s1s2 13G 4.0G 8.3G 33% /private/var
/dev/disk1 242M 72M 170M 30% /Developer
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嘗試卸載掉 /Applications 目錄的一個應用，發現 / 目錄的可用空間多了 6.1MB，再次使用 dpkg -i eXfaker.deb 命令安裝應用就沒問題了，信息如下：
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# dpkg -i eXfaker.deb
Selecting previously deselected package net.exchen.exfaker.
(Reading database ... 2307 files and directories currently installed.)
Unpacking net.exchen.exfaker (from eXfaker.deb) ...
Setting up net.exchen.exfaker (1.2.5) ...
# uicache
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原文地址：https://www.exchen.net/ios-hacker-no-space-left-on-device.html