Accessing all of replacement drive

I am sure this is a very silly question, however, here it goes.
I purchased ATI to replace a HDD in a desktop workstation with 80GB with an HDD with 500GB. I backed up the original to an external drive, replaced the old drive with the unformated new drive, booted the computer from the ATI recovery disk, restored the the back up to the new drive.
All seems to work well, however, the new drive now shows (under My Computer) that it is an 80 GB drive.
What do I need to do so that I can access and save data the entire drive?

Go to control panel, administrative tools, computer management, storage, disk management.
Highlight (right click c:\) and extend.
If you do automatic with your restore instead of manual it should do this automatically.

Thank you very much!
I was actually able to figure that out through the power of the internet, but your response is much appreciated.
I am not sure why ATI didn't extend automatically other than user-error.
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You're welcome. Main thing is you got it working.
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(01). Cleanup Utility (02). Cloning Correctly (03). Clone vs Backup
(04). Community Tools (05). Contact Support (06). Product Documentation
(07). Locate Last Volume Fix (08). Fix Audio Issue
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(01). Dell Driver Packs (02). HP Driver Packs (03). IRST Drivers
(04). ADK WinPE10 (05). OS MBR vs UEFI (06). BOOT MBR vs UEFI
True Image and Snap Deploy
Motherboard: Gigabyte GA-Z170X-Gaming 3
CPU: i5 6600K (OC 4.3 Ghz)
Memory: 32GB Corsair Vengeance DDR4 (OC 3000 Mhz)
NVMEs: Samsung 970 EVO Plus 500GB X2, Samsung 950 PRO 256GB, MyDigital BPX 500GB
SSDs: OCZ Vertex 4, PNY XLR8
HDs: WD Black 3TB, 2TB
OS: Win 10 Pro x64
NAS: WD MyCloud 4TB
MVP Tools:
(01). MVP WinPE Builder (02). MVP LogViewer (03). MVP Google Drive
Acronis Tools:
(01). Cleanup Utility (02). Cloning Correctly (03). Clone vs Backup
(04). Community Tools (05). Contact Support (06). Product Documentation
(07). Locate Last Volume Fix (08). Fix Audio Issue
Drivers, WinPE and Booting:
(01). Dell Driver Packs (02). HP Driver Packs (03). IRST Drivers
(04). ADK WinPE10 (05). OS MBR vs UEFI (06). BOOT MBR vs UEFI
True Image and Snap Deploy
Motherboard: Gigabyte GA-Z170X-Gaming 3
CPU: i5 6600K (OC 4.3 Ghz)
Memory: 32GB Corsair Vengeance DDR4 (OC 3000 Mhz)
NVMEs: Samsung 970 EVO Plus 500GB X2, Samsung 950 PRO 256GB, MyDigital BPX 500GB
SSDs: OCZ Vertex 4, PNY XLR8
HDs: WD Black 3TB, 2TB
OS: Win 10 Pro x64
NAS: WD MyCloud 4TB