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In the scenario where a RAID1 array does not appear after configuration on a Windows 7 Enterprise system, the most appropriate action is to install the drivers for the RAID controller.

When a RAID array is created, the operating system requires specific drivers to recognize and manage the RAID configuration properly. If these drivers are missing or outdated, the logical drive may not be detected by the operating system, leading to it not appearing in Windows Explorer or Disk Management. By installing the correct drivers for the RAID controller, you enable Windows to access the logical volumes created by the RAID setup, allowing the array to be recognized and utilized.

Though formatting the drives might seem like a potential solution, it would erase any existing data and could complicate the situation if the RAID array has not been properly recognized yet. Updating the operating system may be beneficial in other contexts, but simply having an up-to-date OS does not guarantee that RAID array drivers are installed or functioning correctly. Similarly, replacing the SATA drives is a more drastic measure that does not address the issue of driver recognition and would not be necessary if the problem lies with software configuration rather than hardware faults.

Thus, installing the drivers for the RAID controller directly addresses the root of the issue, making the logical RAID drive detectable