If a partition cannot be accessed, Disk Drill will attempt to locate and rebuild it using several powerful tools. The first is a Universal Partition Search, which can recover deleted partitions on Mac HFS+ volumes – plus FAT and NTFS volumes – and will create a virtual partition for any that are found. The second is Scan for Lost HFS+ Partition, which finds and rebuilds HFS+ partitions on your Mac, if they have been reformatted. And finally, there is Rebuild HFS+ Catalog File, which can rebuild the catalog of an HFS+ partition that won't mount correctly. These features along with HFS+ Extraction, new with Disk Drill 3, combine for unparalleled support of Mac partition recovery.
Once you have located or rebuilt the catalog of the lost partition, you can proceed with Mac data recovery. If you can't recover your partitions exactly as they were, you may still get your valuable data back. Below is an overview of the steps you can take with our Mac partition recovery software. For detailed tutorials, see How to Install Disk Drill and How to Recover Lost Files with Disk Drill Basic in our Knowledgebase.