Dual boot - Windows 7 Already installed - Win XP Partition Unknown


My pc info -
AMD Athlon™ 5150 APU with Radeon™ R3
Motherboard Gigabyte AM1M-S2H
Northbridge AMD K16 IMC rev. 00
Southbridge AMD Kabini FCH rev. 7.2
Memory Type DDR3
Memory Size 4 GBytes
Windows Version Microsoft Windows 7 (6.1) Professional 64-bit Service Pack 1 (Build 7601)

vendor American Megatrends Inc.
version F2
date 06/20/2014

Ahci driver used - rcxpahci modified by fernando


I have windows 7 installed on c drive.
I would like to dual boot with winxp.
I slipstreamed with AHCI driver.
When the windows xp installation menu loads to partition choosing page.
It shows my whole HDD as one partition.
The partition is like - Partition1 Unknown.

WinXP is not able to read the hard drive partition.
How can I fix this ?

Thanks and Regards

EDIT by Fernando: Unneeded blank lines removed (to save space)

@sevexps :
Welcome at Win-RAID Forum!

You can fix this issue by installing Windows XP and Windows 7 in LEGACY mode (using the Master Boot Record as partition table).
You obviously have installed Win7 in UEFI mode using the GuiMode Partition Table, but it cannot be read by the 32bit variant of Windows XP.
For details please look >here<.

Dieter (alias Fernando)

Thank you for the correct answer to my query,

I have data and OS on these partition , How can I convert to MBR without losing OS and data ?


Why don’t you do a Google search yourself?
I found a lot of guides like >this< one after having done it.