What would you do with a 3.9 TB disc?
 

Yes, that's 39000 GB on a single disc using holographic techniques to store information. The information us stored in interference pattern of two laser beams. The discs are christened HVD, Holographic Versatile Disc. These discs wll have a transfer rate of 1GB/sec.
I can't think of any reason why I would want one. But who knows wat the future holds? My first PC at work had a 40 Meg hard drive. I can't recall how much memory it had. The first PC I bought had 128 Megs of RAM and a 6.4 GB hard drive. I never filled it. It died and I could n ot find anything that small. I had to buy a 40GB hard drive even though the OS did not support an HD that big. I think the largest size the OS could support was 33 GB. So I ha to partition it.
I bet ScottC is already planning to get one. ;)

Its actually 3,993.6 GB. Much more than I need now

My answer to the question is probably "download lots of porn".

People with a lot of video and high res pictures?

I've downloaded a few movies and in HD they can be as much as 2GB/hr and with my D90 on the HD setting I regularly have .5GB files for movie clips.

Also I have the D90 set for RAW + JPEG and our last family trip was over 24GB of pictures (before clean up)

We have filled about 3/4 of our 1TB drive but have been better at cleaning up older/bad pictures and videos so that will probably go down soon.

if its cheaper than 4 1tb drives id get it...

I still have over 200 5.25" 1.2 megabyte floppies I bought for 49 cents each. Now, THAT was a fantastic deal.

totally depends on price, but I think they will have a great potential for backups. You could backup and keep many old sets of the backups, like every machine in a small to medium sized office, and have one disk with the data off site someplace.

My first PC had a 20 meg hard drive, that was a huge upgrade from the dual floppies.

I mean look at how many people are copying single files to a dvd and closing them, leaving 99% of the disk empty just to bring something home or whatever. Probably for the most part, these disks, again if priced low enough, will be the same thing.

I could use something like that. I currently have two 1-terabyte RAID NAS on my home LAN (total - 2 terabytes of storage) and each is about 3/4 full. I store my entire life on them - everything I've ever downloaded, documents, pictures, etc. I also use them for video storage. A Blu-Ray disk alone can take up to 50 gigabytes, so, as far as I'm concerned, the more cheap storage the better.

I would not use for backups unless there is some improvement to Bit Error Rate (BER) of HVD vs. SATA, SAS, or STK T10k, either in the media itself, or in increased use of data integrity mechanisms.

Backups!

My bad, out an extra zero. It's nominally 3900 GB.

a real GB or a HD manufacturers fake GB? :D

But the reader /writer won't be cheap at first.

Nominal. You do know wahat I mean. Right?

I remember professors doing research on 3 dimension storage when I was in school, many moons ago - I always wondered why it never got to market.

I, too, remember my 512KB Mac, then the whopping 4MB Plus, and my first 40MB hard drive. I'm sure 4TB will seem like the cost of entry in 15 years, though I can't currently fathom what will consume that amount of space. I suppose full 920x1080p/60fps video will suck up a lot. We'll probably have that streaming from our cell phones in a decade.

I already have a couple of TB around the house in various primary/secondary/backup/secondary backup.