questionswhat is the largest external hard drive?

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3TB is the largest single-drive external enclosure I've seen. You could build something larger using a RAID/JBOD enclosure.

vote-for9vote-against

The IBM 3380 and 3390 are the largest I ever saw - the size of a refrigerator and weighing in at about 550 pounds.

String four of those boxes together along with a control unit and you have a huge honking 10 GB of heavy metal (oxide) storage.

http://www-03.ibm.com/ibm/history/exhibits/storage/storage_3380.html

vote-for8vote-against

Here you go:

Biggest Sold on Newegg is 16TB:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822240055

I would recommend getting a 3TB from Staples (with USB 3.0)for $159.99: http://www.staples.com/HP-3TB-External-Hard-Drive-USB-3.0-and-USB-2.0-USB-3.0/product_923766

But First go to Ejunkie and buy a coupon: ($30 off $150) for $2.99
http://www.e-junkie.com/shop/product/466569.php#%23+%242.99+Staples+30+Off+150+coupon+Codes+from+coupon4u+SKU%3A3B3+P1+Exp.+9%2F16

So basically $27 off $159.99 bringing your total to: $132.99 for a 3TB External Hard Drive.

Just an FYI on USB2.0 vs USB3.0--- USB 3.0 transfers 10x faster than USB 2.0 and if you are moving over terabytes of information, YOU WANT 3.0!

I'd love to have 1 Exabyte of storage:

Bit Single Binary Digit (1 or 0)
Byte 8 bits
Kilobyte (KB) 1,024 Bytes
Megabyte (MB) 1,024 Kilobytes
Gigabyte (GB) 1,024 Megabytes
Terabyte (TB) 1,024 Gigabytes
Petabyte (PB) 1,024 Terabytes
Exabyte (EB) 1,024 Petabytes

vote-for5vote-against

Not sure but the answer will be different tomorrow.

vote-for3vote-against

Do you mean for consumer use or Cutting Edge?

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@durkzilla: I used to service the 3330's and related models with removable platter arrays. How about a Singer Mainframe that supported four disc drives, each larger than a washing machine and running a whopping 1.5 Mb disc? (It was at an IRS Service Center).

I guess the OP should have asked "what's the largest capacity" drive.