Ponch, Before formatting I only knew about two partitions, C:, where Windows was installed, and D:, where my documents were. During Windows installations, it found: C: 100 GB as Disk 0 Partition 1 (where Windows was installed) A 15 Gb partition as Disk 0 Partition 2 D: 200 GB as Disk 0 Partition 3 (where my documents were) A 16 Mb partition as Disk 0 Partition 4. I formatted C: and re-installed Windows there. Now that I have my missing partition back, disk management is showing the following: - A first 16Mb partition with no letter assigned - EFI System Partition - A second NTFS 100Gb partition, C: - Boot, pagination file, error image, Primary Partition - A third FAT32 15 Gb partition, D: - Primary Partition - A fourth NTFS 200 Gb partition, E: - System, Active, Primary Partition I am thinking about merging D: with E: JS