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By deleting all of the partitions, then letting windows recreate what's needed, there's a better chance of overwriting free space on our drive making data unrecoverable. We also like to do this for security reasons.
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We're old school, and we prefer to select all partitions on our primary (C) drive and delete them all, then allow Windows to create whatever partitions are needed before installing Windows. To be honest, partitioning and formatting a hard drive nowadays is required only if you want to partition off space for storage. When you install Windows, all you need to do is select the drive and Windows will partition off the space it needs for system files as Windows itself. TIP: Hard to fix Windows Problems? Repair/Restore Missing Windows OS Files Damaged by Malware with a few clicks
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