I'm sorry, but "JHFS-" does not appear to be a recognized term or concept within the Apple environment or any standard technical domain related to Apple systems. It might be a typographical error or a very niche term not widely recognized.

If you meant HFS+ (Hierarchical File System Plus), which is a file system developed by Apple Inc. for Mac OS, I can provide information on that. However, if JHFS- is indeed what you intended, please provide more context or clarification.

Assuming you meant HFS+, here's an article on that topic:

HFS+ (Hierarchical File System Plus) is a file system developed by Apple Inc. for use in computer systems running macOS. Though newer macOS versions use APFS (Apple File System) by default, HFS+ is still relevant for compatibility with older systems and external drives. This article will guide you through managing HFS+ file systems on macOS.

Examples:

1. Checking the File System Type of a Drive: To determine if a drive is formatted with HFS+, you can use the diskutil command in Terminal.

   diskutil info /Volumes/YourDriveName | grep "File System Personality"

   This command will display the file system type of the specified drive.

2. Formatting a Drive with HFS+: If you need to format a drive with HFS+, you can do so using diskutil.

   diskutil eraseDisk HFS+ NewDriveName /dev/diskX

   Replace NewDriveName with your desired drive name and /dev/diskX with the appropriate disk identifier.

3. Repairing an HFS+ Drive: If an HFS+ drive is experiencing issues, you can attempt to repair it using diskutil.

   diskutil repairVolume /Volumes/YourDriveName

   This command will check and repair the specified volume for any file system errors.

4. Mounting an HFS+ Drive: If an HFS+ drive is not automatically mounting, you can manually mount it using diskutil.

   diskutil mount /dev/diskX

   Replace /dev/diskX with the appropriate disk identifier.

If you were referring to something else by "JHFS-", please provide additional details or context so I can assist you more accurately.