Memorua usb

BT, tengo una memoria usb Kengston  con las siguientes caracteristicas

Description: [H:]Dispositivo de almacenamiento USB(USB DISK 2.0)
Device Type:  Mass Storage Device

Protocal Version: USB 2.10 <- Hint: This device can run faster when plugged to a USB3.0 port
Current Speed: High Speed
Max Current: 498mA

USB Device ID: VID = 13FE PID = 0100
Serial Number: 19A181CDA22B

Device Name: USB DISK 2.0
Device Revision: 0110

Product Model: USB DISK 2.0
Product Revision: PMAP

Controller Vendor: Phison
Controller Part-Number: PS2251-07(PS2307) - F/W 01.00.35 [2014-01-17]
Flash ID code:      ADDE94DA74C4 - Hynix H27UCG8T2A [MLC-8K]

Tools on web: http://dl.mydigit.net/special/up/phison.html


Possible Flash Part-Number
----------------------------
[1CE]H27UCG8T2A
[2CE]H27QDG8UDA


Flash ID mapping table
----------------------------
[Channel 0] [Channel 1]
es de 64 GB   y solo muestra 8 GB
como puedo recuperar el espacio perdido