Windows 10: Windows 7 C drive nearly full, mostly unknown data

My wife's desktop is running Windows 7 Pro, fully updated. Over time the C drive will get very full. The first time was on her original 512G HD, which expanded to less then 20GB full. I ran a drive analyzer and most of the space showed as unknown. I bought and installed1TB SSD, and restored from an Acronis File and Folder C drive backup. The used space was back to 150GB. This week the C drive was a 881GB used. I did the backups and restore, and it is back to 160GB used.Does anyone have any idea what might be happening?I am still a little way away from upgrading to Windows 10.That takes a lot o

:)

 

No C: but D: drive has all the data

Hi Austin,

To help you with your concern regarding the data on the drive C:, you're seeing the drive "C:" as the drive "D:" because you're booting your computer outside Windows. When booting your computer outside Windows, the system is reading the recovery partition
as drive C: and the data in the drive C: \ are listed on the drive D: \. Try to boot your computer and try to check again the data in the drive C: \ and see if the data are listed.

Regards.

 

GPT disk conversion for both data drives and C drive


Macrium Rescue disk can be used to convert from MBR to GPT and vice versa without doing a fresh install of Windows.

1. Download Rescue6.1.1081X64.iso - Google Drive and use Rufus to create a bootable USB disk. Skip this step if you've already created the Macrium Rescue disk.
2. Download: BootEFI_Only-00-00.zip - Google Drive . Unzip to an external or an internal HD
   NOTE: This is a copy of the first 3 partitions of my current Windows 10 x64 (450MB Recovery, 100MB EFI and 16MB MSR)
3. Boot up Macrium Rescue disk and create a backup of your current Windows to another internal/external HD. It serves 2 purposes: you'd have a backup of your current Windows in case things go wrong and then use it to restore the C drive on the next steps.
4. Next, switch the BIOS to UEFI and use Macrium to restore the first 3 partitions downloaded in step 2 to your current MBR Windows. No need to convert or Format, Macrium will do it.
5. Again with Macrium, select the backup image from step 3, and copy back the C drive after the 3 partitions.
   After this step, you should have: 450MB, 100MB, 16MB and C drive (GPT partition scheme)
6. From Macrium, click on Fix the Windows Boot Problems
7. Reboot. Your Windows should be in UEFI mode.

 

Data In Drive "C"

what will happen to my data stored in c drive if i upgrade it from windows 7 or 8.1 to windows 10