[Ernest_at_the_Beach]

Zettabyte - Wikipedia, the free encyclopedia

The zettabyte is a multiple of the unit byte for digital information. The prefix zetta indicates the seventh power of 1000 and means 1021 in the International ...

en.wikipedia.org

en.wikipedia.org/wiki/Zettabyte

[Ernest_at_the_Beach]

Try this one:

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What is zettabyte? - Definition from WhatIs.com

A zettabyte is a measure of storage capacity and is 2 to the 70th power bytes or, in decimal, approximately a thousand exabytes or a million terabytes.

searchstorage.techtarget.com

searchstorage.techtarget.com/definition/zetta

[Ernest_at_the_Beach]

Anandtech has an article that describels the new technology:

Seagate to Ship 5TB HDD in 2014 using Shingled Magnetic Recording

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by Anand Lal Shimpi on September 9, 2013 8:00 AM EST

It's not just planar NAND that's running into physical limits lately. According to Seagate, its latest 1TB platter 3.5" drives have shrunk read/write heads as small as they can physically go. Similarly, tracks on those platters are placed as close together as physically possible. Pushing areal density is important to increase overall capacities (no one wants to see more platters per drive), but if we're at physical limits today then it's time for some architectural changes to push capacities going forward.

Seagate's solution is something it calls Shingled Magneting Recording (SMR). The process is pretty simple. Track size is traditionally defined by the size of the write heads, as they are larger than the read heads. The track width is larger than necessary from the perspective of reading data back in order to decrease the chances of reading data from adjacent tracks. Seagate's SMR exploits this reality.

[Marine_Uncle]

One thing is for sure. I would have a hard time counting up to a Zeta Byte using my ten fingers. :)
These companies sure continue to push what some would view as limits.