Windows 7 RTM Installer deleted logical Partitions

My computer has two physical hard disks, each with multiple partitions. I did a custom installation of Windows 7 Professional RTM on the first hard disk, deleting an old primary partition containing Windows XP (which wouldn't start). However, after I installed Windows 7, ALL of my logical partitions on this disk had also disappeared. The Windows 7 Installer creates two primary partitions: the big partition I realized it, and a partition of 100 MB system reserved. (It is always not allocated the remaining space on the disk, as the new partition for Windows 7 was smaller than the Windows XP partition, which I've deleted.)

Former route:

GiB 250 NTFS (primary)
100 MiB ext2 (primary)
3 logical partitions (two ext3, a FAT32)
100 giB encrypted (primary)

New layout:
100 MiB NTFS (primary)
149.9 giB NTFS (primary)
Unassigned 100 GiB
100 MiB ext2 (primary)
115,66 giB space (!) free where the logical partitions used to be
100 giB encrypted (primary)

It seems that the installation program has decided to get rid of my extended partition. How can I recover my old logical partitions?

I managed to restore the missing partitions to aid CGSecurity's TestDisk, but it took some doing. Always, however, the fact that the Windows 7 Installer has deleted my partitions without asking confirmation is more worrying. That's what I guess happened:

Disc has 3 primary partitions and one extended partition, before starting the installation.
I told the installer to remove a primary partition and create a new one in its place to install Windows 7 on. He wanted to do a second primary partition, so she won another partition to delete. He didn't tell me that. He said he may need create additional partitions, but nothing has been said to delete those that already exist.
The Setup program has installed Windows 7, and my extended partition was gone (so logical partitions inside it were no longer accessible).

I recommend strongly anyone install Windows 7 on a disk that contains several other partitions to create a partition for Windows 7 in advance (using the management of disks or DiskPart.exe), instead of using Setup to do. In this way, it will not create the partition of MiB 100 extra.

Tags: Windows

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