在BXP3.1的新建磁盘选项中的第二、三项是什么意思？作用是什么？我用金山快译看了半天也没能搞清楚是做什么的。下面是帮助文件中的内容：
Standard Virtual Disk - The disk is a standard BXP virtual disk with a virtual disk file residing on an IO server. This type of disk can be used to record an image of a hard drive (using the BNImage utility) and can then subsequently be used to remote boot the a PXE enabled client.
TFTP Chained Bootstrap Disk Template - This disk is a placeholder in the virtual disk assignments to a client workstation. When a client boots from this type of “disk” (usually in response to a disk menu selection) the BXP bootstrap program will load the 3rd party bootstrap program pointed to by this disk’s properties and execute it. In this way, for example, a Linux PXE bootstrap program can be chained to from the BXP bootstrap program. A client can therefore be set up to boot from Windows, Linux, or any other OS that supports PXE boot by simply assigning a TFTP Chained Bootstrap disk pointing to the 3rd party PXE boostrap for the OS you want to boot.
Local Fixed Disk Template - This disk is similar to the TFTP Chained Boostrap Disk Template except that it represents booting from the Local Physical Hard drive of the client. Normally this type of disk is assigned to the client as part of a disk menu. In this way the user can select booting from the local hard drive or from a virtual disk on the BXP server.
