推荐回答（3个）
在我的 Mac 电脑中，当前 iPhoto 在磁盘中占用的空间已经达到了25GB，可能我这个还算是小的，相信还有更大的。可以相像一下，如果你的 MacBook 笔记本硬盘空间为 128GB 的话，再加上系统本身要占用的空间和一些你安装和应用软件，将会很快出现空间不够用的情况。
接下来先要找到 iPhoto 所存放的目录位置，它默认是储存在 Mac 的“图片”目录中
找到了 iPhoto 的照片库以后，接下来需要准备一个容量的存储设备，最好是移动硬盘。当然存储设备最好是在 Mac 上的“磁盘工具”里格式化为 Mac OS 扩展格式的。
随后先把图片目录的 iPhoto 整个目录拷贝到移动移动中，
当把 iPhoto 的照片库转移到其它设备上以后，接下来请打开 iPhoto 应用软件，点击顶部的文件菜单栏，然后选择“切换到图库”选项，
随后在 iPhoto 的图库管理窗口中，可以看到当前系统默认的图库，以及它所在的位置。此时可以点击“其他图库”选项
接着请选择之前转移到其它设备上的 iPhoto 图库的位置，选择并打开就好。
随后会提示是否要将 iPhoto 的默认图库更改为刚刚选择的图库，此时请点击“重新启动”按钮。
当添加好以后，重新打开图库窗口，可以看到此时默认的图库已经更改到移动硬盘上，
当一切弄好以后，为了照片数据安全考虑，个人建议先在使用一下新的 iPhoto 图库（即其它设备中的图库），如果确定没有问题了，接下来就可以把原来保存在图片目录的 iPoto 图库移除到废纸篓了，最后再清除废纸篓就好了。
当然这个方法唯一不好的地方就是，当使用 iPhoto 时，必须接入之前转移图库的移动存储设备，否则就会出现让选择图片库的窗口。
系统偏好设置-----启动磁盘-----选中系统盘重新启动
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