I have a Toshiba Satellite P775-S7232 an i5 based laptop with 6GB RAM and 640GB HDD preloaded with Windows 7 x64 purchased one month ago. This laptop's hard disk has the following partitions.

1.4GB Healthy (Active, Recovery Partition)
This little partition contains the Windows Recovery Environment. The fact that it's marked Active, tells us that it also contains the boot files for Windows (bootmgr.exe and BCD in the boot folder).

450.21GB Healthy (Boot, Page file, Crash Dump, Primary Partition) "C: Drive"
The big partition contains Windows of course. It's named the Boot Partition by Microsoft. (Microsoft calls the one with the boot files the System Partition.)

14.09GB Healthy (Primary Partition)
The third partition contains the image that was used when you restored the hard disk to it's factory defaults.

"Create a system repair disc" (All Programs - Maintenance) utility will create a Windows 7 Repair DVD Disc and "Recovery Media Creator" (All Programs - Toshiba - My Toshiba) utility creates 5 DVDs namely Recovery DVD Disk 1-4 and Windows Recovery Environment (x64) from these two partitions.

After taking backup of DVDs the 14.09GB Primary Partition may be deleted and used for normal usage. But it is recommended to keep this partition. Never delete the 1.46 GB Primary Partition as this contains the boot files for booting into Windows 7.

To recover the Windows and Applications for a crashed system, restart the system while holding 0 (zero) key to get into the Toshiba recovery environment.

These DVDs set can also be used to recover the Windows and Applications to the factory defaults.