I was all ready to watch this tonight, and now I have a problem. I watch MKV by putting it on my portable hard drive and playing it through my Blu-ray player USB. I have a PC laptop, but I wanted to download this on my family's MAC, since I don't like leaving my laptop on all day. So it finishes downloading, and I put my portable hard drive in to transfer the file, and it can't be done, and shows the hard drive is read only.
Anyway to get by this? I guess I'll have to buy a BD-R, and burn it as data disc to transfer to my pc?
Most probably, your Mac is running OSX 10.6 or older, which to my knowledge doesn't have NTFS write support; your external drive is most probably formatted with NTFS. What you need to do is get Tuxera NTFS ($30) or an old copy of the ntfs-3g package + macfuse package on which Tuxera is based. google/torrents are your friend.
EDIT: Actually, it looks like NTFS write support IS in the OSX 10.6, but not 10.5 and below. It's just not enabled by default. See here for instructions:
That Apple didn't enable this feature by default should be a strong hint though, so caveat emptor. The comments aren't too reassuring either. So if your HDD doesn't have anything else on it, it's probably worth risking; otherwise I'd just try to hunt down ntfs-3g, which I've used without issue back in my hackintosh days and still use, currently, on my family's Macs
You could make a shared folder on your mac and then access it over the network on the pc, transferring the file to the external drive (which you'd have connected to your pc). Depending on your router, it shouldn't take too long. In the sharing control panel, turn on file sharing, then choose to share via smb so windows can handle it.
Or you could format the external as FAT32 (which is mac friendly), split the big files into smaller (sub-4gb) rar files and copy them to the drive, then connect it to your windows computer, copy the files off, unrar them, reformat the drive as ntfs, then copy them back to the external. ok, that sounds like a stupid idea. would work though.