What happens when I expand a legacy boot drive capacity by more than 2TB?

What happens when I expand a legacy boot drive capacity by more than 2TB?

For systems running in legacy boot mode, all disk sizes are limited by the OS to 2TB in size. This can cause some confusion when expanding boot drives to greater than 2TB.

To work with boot or data drives greater than 2TB your MUST upgrade your system first to UEFI boot mode with a UEFI Windows boot drive, which will most likely involve a re-installation of your OS. A search on the Internet of "Installing Windows 10 in UEFI mode" provides many useful tips on how to upgrade/install your OS in UEFI mode.

NOTE: We have not tested this fully, but Microsoft offers a means to convert your legacy boot disk from MBR to GPT here for some versions of Windows:
Remember, if you attempt this, back up important data first to another drive or storage location before converting.

Below illustrates what happens when you attempt to expand a small 256GB NVMe boot drive with a legacy (not UEFI) boot drive using the FuzeDrive WITHOUT upgrading your OS to UEFI. If using a hard drive for example that is 4TB, we see that 1.9GB of the drive becomes unusable due to the Microsoft OS limit of 2TB.

If you wish to stay with the legacy operating system, then it only makes sense to add a HDD that when combined with the SSD capacity is 2TB or less.

1. DISK MANAGER: Before Converting to a FuzeDrive:
Legacy boot OS pre-Fuze
The above shows the existing legacy boot drive (an SSD in this case) and the empty 4TB drive we wish to expand the boot drive with.

2. DISK MANAGER: After Converting to a FuzeDrive:
Legacy Boot FuzeDrive Post Conversion

3. DISK MANAGER: After Expanding the C: Drive (limited to 2TB by legacy boot environment):

Expanded C: Limited by 2TB Legacy Boot - Unable to Use Additional
The highlighted area is unusable because the legacy operating system limits any physical drives to 2TB. As a FuzeDrive looks like a standard disk drive to Windows, it too will be limited.

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