ASROCK Fatal1ty H87 Performance Installation And Configuration Manual page 20

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If you install Windows 8 64-bit / 7 64-bit on a large hard disk (ex. Disk
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volume > 2TB), it may take more time to boot into Windows or install
driver/utilities. If you encounter this problem, you will need to follow the
instructions below to fix this problem.
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Windows 7 64-bit / 8 64-bit:
A. Please request the hotfix KB2505454 through this link:
http://support.microsoft.com/kb/2505454/
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B. After installing Windows 7 64-bit / 8 64-bit, install the hotfix kb2505454.
(This may take a long time; >30 mins.)
C. Reboot your system. (It may take about 5 minutes to reboot.)
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D. Windows will install this hotfix then reboot by itself.
E. Please start to install motherboard drivers and utilities.
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