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+--- Thread: The DVD makes a comeback? (/showthread.php?tid=284921)
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The DVD makes a comeback? - gadje - 02-21-2024
Meet the Super DVD: Scientists Develop Massive 1 Petabit Optical Disk
https://gizmodo.com/meet-the-super-dvd-scientists-develop-massive-1-petabi-1851272615
Re: The DVD makes a comeback? - gabester - 02-21-2024
one tiny scratch and you lose gigabytes of data!
reading the poorly written article, apparently for them a petabyte of data does not equal ~1,000 terabytes or ~1,000,000 gigabytes, but somehow a DVD-sized disc would only hold 125,000 gigs... so an eighth of PB?
And a storage array of discs high enough to hold a PB would be only 200 centimeters, but the same array out of DVD would be much higher at 2 meters.
Last time I checked, 200 centimeters = 2 meters.
Maybe they're missing a zero somewhere. If I had to guess, 2 meters = a stack of bluray players at 50GB apiece to equal a PB, and just 20 cm for 8 drives for the PB array on this new media.
The valuable part here is 54nm of vertical space split into 100 layers can be read with this new method.
If the article is to be believed...
Re: The DVD makes a comeback? - ztirffritz - 02-21-2024
I think there's some unit confusion in this article.
Re: The DVD makes a comeback? - Tiangou - 02-21-2024
gabester wrote:
one tiny scratch and you lose gigabytes of data!
reading the poorly written article, apparently for them a petabyte of data does not equal ~1,000 terabytes or ~1,000,000 gigabytes, but somehow a DVD-sized disc would only hold 125,000 gigs... so an eighth of PB?
It's a petaBIT.
8 bits to the byte.
1000000Gb to the Pb/8=125,000GB.
Re: The DVD makes a comeback? - jonny - 02-22-2024
Uhhhh... I'm thinking I got robbed on that Terabit drive I just bought!
Re: The DVD makes a comeback? - gabester - 02-22-2024
Tiangou wrote:
It's a petaBIT.
Oh that explains some of it...
But 200 cm is still 2 m... so where's the size reduction this media format is supposed to bring?
Re: The DVD makes a comeback? - Tiangou - 02-22-2024
gabester wrote:
[quote=Tiangou]
It's a petaBIT.
Oh that explains some of it...
But 200 cm is still 2 m... so where's the size reduction this media format is supposed to bring?
"An array of HHD drives that could fit a petabit of data would be about 200 centimeters high. An equivalent array of Blu-Ray storage would be over 2 meters high..."
125,000GB = 125TB
Not sure how they're calculating the height of a drive. I'm not seeing the same numbers when I try to do the math...
Largest hybrid drive available to consumers is 8TB in a 3.5-inch form-factor. Not sure what the height is, but guesstimating about 42mm... 125/8 = 16 hard drives, which stacked up would come to about 672mm. (~67cm.) ... But 4TB HHD drives are more common. 125/4 = 32 drives * 42mm = 1344mm or ~134cm. Not 200cm. :dunno:
An ordinary Blu-ray holds 25GB. 125,000/25 = 5,000 BD. At 1.2mm high, a stack of 5,000 discs would be 6,000mm. That's a stack 6 meters tall. Some Blu-rays can hold 50GB or 100GB... at 50GB, the stack would be 3,000mm tall, or 3 meters. At 100GB, it would be 1500mm or 1.5 meters... So, I guess they're using 50GB as the standard. 3 meters high is "more than 2 meters high."
Re: The DVD makes a comeback? - TheTominator - 02-24-2024
Tiangou wrote:
"An array of HHD drives that could fit a petabit of data would be about 200 centimeters high. An equivalent array of Blu-Ray storage would be over 2 meters high..."
Yeah, but can't they compare it to something that we can grasp?
What would it be in terms of station wagons full of magnetic tapes?
Re: The DVD makes a comeback? - Tiangou - 02-24-2024
TheTominator wrote:
[quote=Tiangou]
"An array of HHD drives that could fit a petabit of data would be about 200 centimeters high. An equivalent array of Blu-Ray storage would be over 2 meters high..."
Yeah, but can't they compare it to something that we can grasp?
What would it be in terms of station wagons full of magnetic tapes?
Ooh!
Okay, so a LTO-8 12/30TB tape holds about 16-18TB. (Marketers call it 30TB.)
125/18=7 tapes.
That's less fun.
Hmm...
Let's go old-school...
A classic Zip cartridge holds 100MB.
125,000GB is 125,000,000MB... Easy conversion to 1,250,000 Zip cartridges.
A Zip cartridge is 6mm tall.
That's a stack 7,500,000mm tall or a 7,500 meter stack of Zip cartridges. (24,606 feet.)
Haven't found a good source for the interior volume of a Buick Wagon (circa 1996, contemporary with Iomega Zip)... But I found the exterior dimensions.
Let's say you wanted to make a few solid scale models of the wagon from your 1,250,000 spare Zip cartridges. (Got to use them for something and they're all gonna have "click of death" anyway...)
A Zip cartridge is (97 x 98 x 6mm) or about (3.82*3.85*0.2) 2.94 cubic inches. The volume of 1,250,000 Zip cartridges would be 3,675,000 cu inches.
The Buick Roadmaster Wagon has exterior dimensions of 217.5 x 79.9 x 60.3 inches or about 1,047,908 cubic inches.
3,675,000/1,047,908 = 3.5 model station wagons made from your used Zip cartridges.
A stack of 3.5 full-scale model Buick Roadmaster Wagons would be about 17.6 feet tall. (About 5.4 meters.)
(You can tell I'm a bit bored tonight.
)Check my math?
Re: The DVD makes a comeback? - Schpark - 02-26-2024
TheTominator wrote:
[quote=Tiangou]
"An array of HHD drives that could fit a petabit of data would be about 200 centimeters high. An equivalent array of Blu-Ray storage would be over 2 meters high..."
Yeah, but can't they compare it to something that we can grasp?
What would it be in terms of station wagons full of magnetic tapes?
200cm = 2m so no difference.