Windows 7 partition C becomes E in win7

[rookie]

win7 is installed on partition C while xp is on E.But in win7,the real partition C becomes E and E becomes C.Why?How to change?

I installed win7 in xp with daemon tools and win7137 iso.The last win7 I installed on C is 7100 RC.

In xp,the real partition C also becomes E and E becomes C.But setting E as the primary partition is good because xp is in E.In win7,partition E is set to the primary partition too,but it's bad as win7 is in C.

 

[unawave]

Forget drive letters for partitions. They don't exist. The drive letter is given by the running operating system. So:
If you are running XP the XP partition is drive C:
If you are running Windows 7 the Windows 7 partition is drive C:

And this is good so. Because some installer of badly programmed programs installs itself always to drive C:

Best way: Open Windows Explorer and give your drive a name. Instead of "Local disk C:" name it "Windows XP" or "Windows 7" or "Data".

 

[davehc]

unawave has it correct. In the early days of Vista BEta testing, Microsoft answered conerned posts with that policy. Lettering of HD's and partitions was old stuff. It is a wrench, when we have grown accustomed to them over so many years, but now, it works for me!

 

[rookie]

solved old problem then encountered new problem

Forget drive letters for partitions. They don't exist. The drive letter is given by the running operating system. So:
If you are running XP the XP partition is drive C:
If you are running Windows 7 the Windows 7 partition is drive C:

And this is good so. Because some installer of badly programmed programs installs itself always to drive C:

Best way: Open Windows Explorer and give your drive a name. Instead of "Local disk C:" name it "Windows XP" or "Windows 7" or "Data".

Thanks.Yes,some installer of badly programmed programs installs itself always to drive C:.

But my problem is when I'm running Windows 7 the Windows 7 partition is drive E:.

I tried some methods like hide drive E: on which xp is, but faild,then I had to format drive C: and reinstall win7137 and it's OK.

But when setting bcd I encountered a trouble.My xp is on drive E:.I input commands below:
bcdedit /create {legacy} /d "windows xp"
bcdedit /set {legacy} drive partition=E:
bcdedit /set {legacy} path \ntldr
bcdedit /displayorder {legacy} /addlast

But I have to copy NTDETECT.COM and boot.ini to drive C:,if not I cannot login in xp.Why?