Storing information very securely

[Don Parsons]

Hello,
What is the most reliable and secure storage device (external hard drive 
or other) for securing a few files with summaries of personal information?
I don't trust flash drives.
The drive technology and password system should be standard so that it 
will survive many years.
I use Ubuntu 12.04 because 14.04 seems to have too many errors. I do not 
want to use android systems.
I am using a Toshiba EXT external hard drive KCC-REM-TSD-CanV63 500GB 
for routine storage but I want a separate device (that could be smaller) 
for personal information.
Thanks
Don Parsons