After restore, Hard drive doesn't show correct size???

I bought a new 1 terabyte drive and restored my full backup to this drive. The old drive was 700Gig. After I completed the restore it looks like my 1 Terabyte drive is only 700GIG now. What happened to the remaining 300gigs?

 

One option would be to perform the restore again but choose the partitions rather than checking the disk option. This would allow you to resize each partition.

Another option by DwnNdrty is to
Try the Secure Zone trick. In essence it goes something like this:
1. Use the TI Rescue CD to do this.
2. Boot with the cd and choose to make a Secure Zone. The size doesn't matter.
3. Be sure to NOT accept the default to activate the Startup Recovery Manager.
4. After the SZ is made, go right back into Manage the SZ and choose to Remove it.
5. When asked what to do with the space, choose to append it to the drive. All of the lost space will be appended, not just what was the SZ.