Recovering from your Mac’s internal hard drive is a bit trickier than recovering from external drives. The first step is to stop using your Mac as much as possible. Any activity can overwrite the data you are trying to save. In an ideal world, you would recover deleted files using Target Disk Mode with another Mac. If that’s not possible, we recommend installing Disk Drill in Portable Mode on a USB drive. Also, read through this article if you need to recover data on Mac Mini SSD (such as the flash storage portion of a Fusion drive).
After installing Disk Drill make sure to activate its data protection features: Recovery Vault, Guaranteed Recovery and S.M.A.R.T. monitoring. These will work towards minimizing the chance of data loss in the future and will provide you with easier Mac Mini hard drive recovery.
When Deep Scan is working through the raw data from a hard drive it doesn't matter if it is FAT, NTFS, etc. All the data is just a series of bits to our Mac Mini hard drive recovery software. Going through the accessible fragments of files Disk Drill applies its knowledge of file signatures to them. Once the known signature is found, file types like .jpg, .doc or .xls, etc. are easy to restore.