Can't open my external hard disk, it's saying to Format it.

My external HD is buffalo 1t. For some reason after I put the password , I can see the drive and when I try to open it, is saying f:/ is not accessible the parameter is incorrect.

i do have the same problem pls share me ur mail address or send me the solution to my email ID "******@gmail.com"

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when i try to open my portable drive it shows : " You need to format the disk in drive K: before you can use it. Do you want to format it?"

but i need all data inside that portable drive . what should i do ? 

could u help me ??

First - try it in multiple ports on said computer...

Second - try it in multiple computers - best bet is computers with various operating systems...

Remember - the point here is NOT to make the USB key WORK in a given computer at this point, but to get the data off of it FIRST.

What was said USB stick formatted with?  (What operating system was used to format it, what file system was used on it?)

You can get that message from a stick that has been formatted to a file system not natively accessible to Windows as well as with a USB stick that has gotten corrupted/worn out.