I'm kinda new to the world os Macs and OSX so be kind 
I tried plugging my external hard drive into my MacBook but it isnt recognised in OSX. Its formatted NTFS and is just full of music.
I assume it needs to be Mac formatted for it to work and if so is there a way to convert it without loosing the data on it ?

I tried plugging my external hard drive into my MacBook but it isnt recognised in OSX. Its formatted NTFS and is just full of music.
I assume it needs to be Mac formatted for it to work and if so is there a way to convert it without loosing the data on it ?