第二个链接地址写了:
Embedded install on USB or HDD
The OS boot loader and a compressed NAS4Free file system will be installed on HDD/USB/CF.
The OS will boot from HDD/USB/CF and the compressed file system will be decompressed to RAM, and then run from RAM.
Advantages:
Easy to update and maintain.
Damage resistant: Changes are not saved. If by mistake you delete/modify a system file, just reboot and you get everything like before.
Disadvantages:
The root file system will use space in your RAM.
The root file system will be limited to the amount of RAM it uses/gets allocated.
Difficult to customize. Changes to the OS (deletions/modifications/plug-ins/additions) are not retained.
Full install on USB/HDD/CF
The OS is not loaded onto a RAM disk, all reading and writing is done on the hard disk or USB/CF device.
Advantages:
Saves RAM, only necessary files will be loaded on RAM.
You can define the size of the root filesystem.
Easy to customize.
You can install extra packages and / or plug-ins.
Disadvantages:
Difficult to maintain and upgrade.
Any changes ( deletions / modifications / plug-ins / additions ) are permanent / final.
Easy to break the system if you make a mistake.
Must make sure you have a backup of the OS partition before you try to customize.
Should be installed onto hard drive because constant reads/writes will shorten the useful life of USB flash / CF cards.