Linux windows dual Hard Drive boot

the computer has two hard disks, Ubuntu is on hd0, XP is on hd1, and XP menu is started. lst.
the time written by myself into XP may be incorrect. This is generated by Ubuntu and the time is correct.

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title: content displayed in the GRUB menu at startup
rootnoverify (hd1, 0): The rootnoverity command instructs grub not to mount (hd1, 0) the partition, but to know that the operating system on the partition will be activated.
savedefault: record the previous selected system, which has no effect and can be removed.
makeactive: Set the active flag in this partition, as long as the operating system is windows.
map (hd0) (hd1): disk ing and switching, because it can only be started from the first disk
map (hd1) (hd0)
chainloader + 1: specify the first sector in the partition for activation
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http://www.host01.com/article/server/00070002/0621409033719336.htm