

You can use a third-party app to write to an NTFS disk on a Mac.

As a consequence, you won’t be able to add, change, or delete files. On macOS, you can only read disks in this format, not write to them. Is your external hard drive showing up as “read only” on your Mac? This usually happens because the drive is formatted with Microsoft’s NTFS file format. Here’s a guide to macOS disk permissions to help you understand the technical concepts. This lets you set the permissions to Read & Write to yourself while keeping the read-only for other users. If this is a drive you formatted yourself, you can change the individual permissions in the box above. A WD M圜loud will likely serve you.You won’t see this option if the external storage is used as a boot drive or a Time Machine backup drive.

Your needs will likely be less than mine. Keep in mind the size of the unit is then half'ed so a 2TB unit is really just 1TB in storage space! I have a Drobo NAS and all of my systems use it for backup. I would recommend setting up the NAS in mirror mode so each drive is a copy of the other in case one fails you have a backup of the backup files. Reference: Best NAS for Mac – for Households and SMBs For your external drive you can just copy it over from your older system to a shared folder on the NAS. Here you'll connect your systems to it using Ethernet then using TimeMachine to backup your systems. The easiest way is to get a network attached storage system (NAS). You did say you are running out of space on this drive, right -} This is a good time to setup a good backup system not only for your older system but for your new system as well! To get your self out of this you'll first want to make a good backup of your data onto a HFS+ formatted drive.

Snow Leopard if I remember correctly, is the last release that supported the older HFS formatted drives. Apple migrated from HFS to HFS+ with the release of Leopard. I think you're facing a drive formatting issue on your drive.
