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Downgrading from Win 8 to Win 7 - Error:0x80300024
I need assistance as I can't figure out what I'm doing wrong. I have a dell XPS 15 L521x laptop that I am downgrading from Win 8 to Win 7. I'm installing from a DVD. I'm attempting to install Win 7 on a 120GB SSD. Windows 8 was installed on a 2.5 inch 1 tb drive.
I have followed the following instructions in red. I hit a problem at "Where do you want to install Windows". I choose my partition and click next. I get an error message at this point "Windows is unable to install to the selected location. Error:0x80300024." The Disk does show up as Disk 0 Partition1:Windows 7 and has been partitioned to 120GB. Not sure how to proceed.
Boot into BIOS setup, if this is a new Win8 PC look for a setting to disable Secure Boot. Then enable Legacy BIOS or Compatibility Support Module (CSM). This should remove any EFI Boot Disk from BIOS Boot order. Set DVD drive first to boot, HDD second. Then set SATA controller to AHCI. Save changes and Exit.
Then boot into installer DVD or flash stick burned or written using tool and latest ISO for your licensed OS version here.
At first installer screen Press Shift + F10 to open a Command Box, type:
DISKPART
LIST DISK
SEL DIS 0 (after confirming Windows 7 target HD #)
CLEAN
CONVERT MBR
CREATE PARTITION PRIMARY SIZE=102400 (for 100gb partition, adjust as desired)
FORMAT FS=NTFS LABEL="WINDOWS 7"
ACTIVE
EXIT
EXIT