# Petabyte storage?

by MostlyHarmless
Tags: petabyte, storage
 P: 266 So, in the context of computing for the even avid techy, it seems like a Petabyte(1024 Terabytes) of storage on a single drive seems both out of reach, and unnecessary. I mean, on my computer, I've got 1080p (legal) downloads of movies, several very large games, and a comfortable amount of music, and I'm sitting pretty with my 500gb HDD. Of course, plenty of people use much more than me, 3, 4, 5TBs? And obviously, this is generally the mindset we have before each new era in technology. (I'm reminded of a story of a guy who had 1TB of some questionable media, and 5 years ago I thought that was an absolutely absurd, almost comical amount of data.) But now it seems like we should be reaching a limit on the amount of data the above average user can actually use. I've seen 4k UHD, and(to me) its barely differential-able from real life. And a movie in 4k UHD uncompressed, would require your computer to display ~1GB/s. (45MB/frame @ 24frames/s)(http://www.zdnet.com/why-4k-uhd-tele...am-7000009506/). The best most expensive solid state drive I could find has a read speed of about 1.8GB/s, and it has a 1TB capacity(a 2.5 hour movie according to the above link, is about~10tb) and costs about $1,200. So, (I could be wrong here) if you had a SSD with more common speeds(500-800Mb/s), your computer would actually have to buffer as if you were trying to watch a long cat video over 3g. My point being, aside from ubiquitous 4k UHD being impractical under the current infrastructure, EVEN IF 4k UHD(which requires massive amounts of data, and data capabilities) became commonly used, a Petabyte STILL seems like overkill. If you filled a Petabyte drive with nothing but movies in 4k, it would take like a week and a half of non-stop viewing just to watch it all. Assuming the hard drive was fast enough. I have no doubts that we will see a Petabyte storage device eventually, but will just the above average user ever need that much storage? PF Gold P: 6,120  Quote by MostlyHarmless ... this is generally the mindset we have before each new era in technology ... Seems to me you've answered your own question. We don't know why it will be common 10 years from now, but it probably will.  Emeritus Sci Advisor HW Helper Thanks PF Gold P: 6,331 I remember when the first 5Mb HD hit the streets for Apples and PCs (Five whole megabytes on one disk!) The drive itself cost only$3500, more than the computer to which it would be attached. Who would need such a large amount of storage on one machine? Well, the drives didn't stay at 5 Mb capacity for very long, and the price kept dropping, too. Now, it's not unusual to deal with a single data file 5 Mb in size, and applications often have several files this size in their installation. I bought my first 1 Tbyte drive in 2008, and the only reason that you don't see many drives larger than this is due to the limitations of the operating systems which are used, and also other practical considerations. I recently did a CHKDSK /R on that same 1 Tbyte drive I bought in 2008 and it took the better part of 3 days' continuous running to go thru all 5 stages of this operation to completion, and the drive was about 75% used space. IMO, I think the familiar electromechanical device known as the HDD has reached a practical limit on its maximum size. Reliable and convenient storage above a few terabytes will come in fully solid-state form, which has a ways to go before bending the price-capacity curve down far enough for those size drives to become common and practical. Right now, SSD units price out below $0.50/Gbyte, so prices of these must drop a little more for the SSD to become price-competitive with magnetic HDD.  P: 266 Petabyte storage? Right, like I mentioned, a 1TB SSD will cost nearly$1000, as opposed to a 1TB HDD @ about $75. Computing power right now isn't ready for data on the order of a Petabyte. I feel like we are still another storage medium break-through away from Petabytes. Emeritus Sci Advisor HW Helper Thanks PF Gold P: 6,331  Quote by MostlyHarmless Right, like I mentioned, a 1TB SSD will cost nearly$1000, as opposed to a 1TB HDD @ about $75. Computing power right now isn't ready for data on the order of a Petabyte. I feel like we are still another storage medium break-through away from Petabytes. Price Drop Alert: http://www.newegg.com/Product/Produc...sNav-_-UpTo1TB http://www.newegg.com/Product/Produc...9SIA29P1EC5324 A Samsung 840 EVO 1TB SSD is now either$499.99 or $439.99 (there seems to be some confusion of prices at NewEgg.) Engineering Sci Advisor HW Helper Thanks P: 6,959  Quote by SteamKing Price Drop Alert: Even more amazing, the price in GBP on amazon.co.uk is about the same as that newegg USD price. Usually computer hardware and software vendors don't seem to have got their heads around the concept of exchange rates. They just assume £1 =$1.
 P: 266 I'm reading about this "Hyper-CD", seems like there is some argument towards its actual existence. It seems obvious that if it were really what I'm reading it is, we'd all have one. So I'm inclined to think that it's not what it has been made out to be. Another thought, what about RAM? I'm not 100% how it differs from your main memory. But is it possible that RAM could be used as mass storage? http://www.amd.com/en-us/products/memory/ramdisk
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 Quote by MostlyHarmless It seems obvious that if it were really what I'm reading it is, we'd all have one.
Not necessarily. Suppose the disks only cost $1 each, but the disk drive costs$100,000 and needs to be installed in a clean room environment with a "floating floor" to eliminate all vibrations - costing say another $100,000 to build. Google would probably be in the market for them to use in its data centers. Home users, not so much. Remember Seymour Cray's definition of a supercomputer, back in the 1980s: the biggest and fastest machine you can build for 20 million dollars. He could easily have build an even bigger amd faster machine for 50 or 100 million dollars, but that was outside what his customers (national research labs and multinational companies) were prepared to pay. Emeritus Sci Advisor HW Helper Thanks PF Gold P: 6,331  Quote by AlephZero Even more amazing, the price in GBP on amazon.co.uk is about the same as that newegg USD price. Usually computer hardware and software vendors don't seem to have got their heads around the concept of exchange rates. They just assume £1 =$1.
That may not necessarily be true. I don't know what sort of taxes are charged in GB or what sort of import duties may be assessed on these drives, which, AFAIK, are not produced in GB or the EU.

Edit: I forgot to mention one tax with which the US hasn't had to deal with (yet), which is quite common in GB and the EU - the Value Added Tax, or VAT, which is folded into the price of a good, material, or service, at different steps along the way from the item's origin to the ultimate consumer of the item.

In the EU, the VAT can range between 15% to 27%, depending of what is being taxed, and it is not always clear from the purchase price how much total VAT is included.
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 Quote by MostlyHarmless Another thought, what about RAM? I'm not 100% how it differs from your main memory. But is it possible that RAM could be used as mass storage? http://www.amd.com/en-us/products/memory/ramdisk
RAM is your main memory. A RAMdisk sets aside a portion of your main memory to simulate the presence of another disk device.

http://en.wikipedia.org/wiki/RAM_drive

Because accessing RAM is so much faster than accessing a HDD, you would load a very disk-intensive piece of software in the RAMdisk to reduce the processing time of the software.
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