Half of device for storing data in binder (4)
I believe the answer is:
cord
'binder' is the definition.
(I know that cord is a type of binder)
'half of device for storing data' is the wordplay.
'half of' indicates taking half.
'device' becomes 'PC' (PC is an example).
'for' is a charade indicator (letters next to each other).
'storing data' becomes 'ord' (I can't justify this - if you can you should believe this answer much more).
'pc' halved is 'c'.
'c'+'ord'='CORD'
'in' is the link.
Can you help me to learn more?
(Other definitions for cord that I've seen before include "Strong string" , "Thin string" , "Rope; fabric" , "A measure of cut wood" , "Thin rope" .)