如果你跟我一樣安裝了 virtualbox 4.0.8的話，會發現子機無法使用usb
我上網找了許久，完全沒有解答 (就算我加裝了 extension pack也不行)
不過在新版的 4.0.10 已修正了這個問題，我也更新了，且真的可以使用usb了，可喜可賀!!
官網發佈的訊息如下
ref: http://www.virtualbox.org/wiki/Changelog
VirtualBox 4.0.10 (released 2011-06-27)
This is a maintenance release. The following items were fixed and/or added:
- GUI: fixed disappearing settings widgets on KDE hosts (bug #6809)
- Storage: fixed hang under rare circumstances with flat VMDK images
- Storage: a saved VM could not be restored under certain circumstances after the host kernel was updated (bug #8983)
- Storage: refuse to create a medium with an invalid variant (for example Split2G with VDI; bug #7227)
- Snapshots: none of the hard disk attachments must be attached to another VM in normal mode when creating a snapshot
- USB: fixed occasional VM hangs with SMP guests (bug #4580)
- USB: proper device detection on RHEL/OEL/CentOS 5 guests (partial fix for bug #8978)
- ACPI: force the ACPI timer to return monotonic values for improve behavior with SMP Linux guests (bug #8511 and others)
- RDP: fixed screen corruption under rare circumstances (bug #8977)
- rdesktop-vrdp: updated to version 1.7.0
- OVF: under rare circumstances some data at the end of a VMDK file was not written during export
- Mac OS X hosts: Lion fixes (bug #8903)
- Mac OS X hosts: GNOME 3 fix
- Linux hosts: fixed VT-x detection on Linux 3.0 hosts (bug #9071)
- Linux hosts: fixed Python 2.7 bindings in the universal Linux binaries
- Windows hosts: fixed leak of thread and process handles
- Windows Additions: fixed bug when determining the extended version of the Guest Additions (4.0.8 regression; bug #8948)
- Solaris Additions: fixed installation to 64-bit Solaris 10u9 guests (4.0.8 regression)
- Linux Additions: RHEL6.1/OL6.1 compile fix
- Linux Additions: fixed a memory leak during VBoxManage guestcontrol execute (bug #9068)
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