OSX 无法使用 SD 卡上的图片文件作为壁纸？

问下楼主，感觉速度如何？好用么，我正好在考虑入不入。

有缓存的吧，我丢在系统盘的图片删掉后再开机桌面还在，打开偏好设置才会变成默认的。

同样问题的解决办法，暂时没时间测试，记录备查。
http://www.tonymacx86.com/general-help/62011-wallpaper-changes-default-after-reboot-fix.html

If your wallpaper changes back to default (Galaxy) after reboot or after logout it is because

the wallpaper you set was on another drive.
and this drive loads after your settings are loaded.

MAC OS X Lion / Mountain Lion does not save your wallpaper on the native HDD, rather tries to load the wallpaper from the original HDD, i guess only the path to the wallpaper is saved in the OS X settings.

Anyways..
what happens is that when your OS X boots up it does not find the path to your wallpaper since the HDD you've saved your wallpapers in has not mounted yet. :(

One basic solution for this is to save your wallpapers in the HDD where you've installed the MAC OS X..

but I didnt want to save all my wallpapers in Native Mountain Lion HDD, so i figured out my perfect fix..!!

This is how i fixed..

I found this file in my Mountain Lion install pendrive.. autodiskmount.plist

Library/Preferences/SystemConfiguration/autodiskmount.plist

If you can't find it on your OS X Install Drive then you can make one by typing

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple Computer//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="0.9">
<dict>
<key>AutomountDisksWithoutUserLogin</key><true/>
</dict>
</plist>

rename ur txt file to autodiskmount.plist

or download the file from this post.

save this in your MAC OS X HDD

Library/Preferences/SystemConfiguration/autodiskmount.plist

Voila..!!

restart your system..

补充，好使，虽然原帖下面有回复说10.9下无效，不过我10.10测试，是生效的。

更标准的做法是：
defaults write /Library/Preferences/SystemConfiguration/autodiskmount AutomountDisksWithoutUserLogin -bool true

建议还是把图片放在内置闪存比较好。