What is the maximum storage capacity of micro SD cards for my Walkman?

For the following Walkman series:

• NW-A100 series
• NW-A50 series
• NW-A3x series (e.g. NW-A35, NW-A36, etc.) 
• NW-A4x series
• NW-A20 series
• NWZ-A10 series
• NW-ZX300
• NW-ZX507

The maximum capacity storage is as follows:

• For microSD cards, the Walkman can support up to 128GB.
• For microSDXC cards, the Walkman can support up to 2TB.

All Sony micro-SD cards currently available on the market are confirmed to be compatible.
Sony cannot guarantee full compatibility with cards from other brands.