M Discs
 

My Son and his boyfriend are going to buy me a Bluray writer for christmas so i can transfer some old VHS of my ex wife my sons mum before she passed away to Bluray.

Can someone please explain to me what an "M-Disk" is please?

Re: M Discs
 

Take a look at this web http://www.mdisc.com/what-is-mdisc/

Now the M-DISC™ comes in a 25GB Blu-ray! With all of the longevity benefits of our original DVD, the Blu-ray gives you over five times the storage capacity on one disc.