Most likely Single Sided Double Density, referring to floppy disks.
In software engineering it can refer to certain documents:
ssdd
Same S*** Different Day
ssdd
Same sh*t different day
harry potter aww man no SSDD
If you mean in computer technology it's a term used to describe an older and largely unused format of Floppy disks "Single sided, double density" disks. It could also mean "Same sh*t, different day" depending on whom you ask.
cool and rainy weather all year long .
A computer does not develop. You can develop computer programs for a computer.
what does lawyer do on the computer what does lawyer do on the computer what does lawyer do on the computer
a computer not conected to another computer
micro computer mini computer mainframe computer super computer
They would be considered as being computer literate.