How much hard disk space is required to install Win7

A hard disk of about 30 to 35G can completely install the Windows 7 system.

smallest 15G can select the system partition, but to do so requires a series of hard disk space occupied optimize the system, closing some caching function to avoid a system disk system put to sleep like stuffed cause Crash or system crash.
SSDs are mostly used as system disks, but the capacity is relatively small. In order to save capacity, there are some columns of optimized operations, which are also applicable to mechanical hard disks.
If the physical memory capacity has reached 4GB or more, the virtual memory can be turned down or turned off.

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