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Unable to create partition in Windows 7 setup with existing XP partition

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So this computer I bult recently was intended to dual-boot with XP and 7. I created an 80GB partition in the XP setup on my RAID0 array, but when I came to try to install 7 it refused to create a partition. I've not had this problem before. Can anyone shed any light?
 

eidairaman1

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So is XP the primary OS?
 
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Yes. In the past, it's just installed fine and I've been able to dual-boot both XP and 7. But for some reason, this time it just won't let me create a second partition in the Win7 installer.
 
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Why not boot to Win XP and create all you partitions pre-install.

RAID array ? Outside very specialized applications I have yet to see any advantage in RAID 0 and numerous disadvantages. Every 3 years or so I give it a whirl and wind up breaking the array after 3 months or so ... last effort was twin SSDs in RAID 0 and twin SSHDs in RAID 1. Both arrays would routinely disappear, performance was slower not faster in things actually done and Samsng offers no ech support for RAID 0.
 
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System Name Chachamaru-IV | Retro Battlestation
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Cooling Noctua NH-D15 SE-AM4
Memory 32GB Corsair DDR4-3000 (16-20-20-38) | 512MB PC133 SDRAM
Video Card(s) nVIDIA GeForce RTX 4070 FE | 3dfx Voodoo3 3000
Storage 1TB WD_Black SN850 NVME SSD (OS), Toshiba 3TB (Storage), Toshiba 3TB (Steam)
Display(s) Samsung Odyssey G5 27" @ 1440p144 & Dell P2312H @ 1080p60
Case SilverStone Seta A1 | Beige box
Audio Device(s) Creative Sound Blaster AE-7 (Speakers), Creative Zen Hybrid headset | Sound Blaster AWE64
Power Supply EVGA Supernova 750 G2 | 250W ASETEC
Mouse Roccat Kone Air| Microsoft Serial Mouse v2.0A
Keyboard Vortex Race3 | Dell AT102W
Software Microsoft Windows 11 Pro | Microsoft Windows 98SE
Would that work? Windows 7 likes to create a hidden partition for essential boot-related files, I don't think I could do that and have it work.
 
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Would that work? Windows 7 likes to create a hidden partition for essential boot-related files, I don't think I could do that and have it work.
It should work. The files that are usually on the hidden partition will be put on the Windows 7 partition if the hidden partition is not available.
 
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