It sounds like you are trying to recover data from an SD card and not the hard drive. Correct me if I'm wrong
The Samsung drive looks like the 128GB SSD drive that comes with some Lenovo T420 notebooks.
The PNY USB drive looks like it is probably the USB drive that you are using to boot PartedMagic from.
I don't see any other mountable USB drives listed.
While in PartedMagic
Open a Terminal (click the picture of a monitor in the lower left by the MOUNT DEVICES button) and typefdisk -l
and hit enter (that's fdiskSPACE-l as in Lima)
In the results, do you see any other drives listed besides the SAMSUNG MZ7PA128 and the PNY USB 2.0 FD?
If the device that you are trying to recover from is not visible then we can not use these tools on it.
Here is a trick that sometimes makes them visible.
If it is from a camera or phone, don't use the reader and try using the device instead.
Put the SD card in the device it is from (camera or phone) and connect that device directly to the USB. Sometimes it detects the memory card better this way.