diff --git a/src/calibre/devices/prst1/driver.py b/src/calibre/devices/prst1/driver.py
index d2482d51a0..0bf1cbede8 100644
--- a/src/calibre/devices/prst1/driver.py
+++ b/src/calibre/devices/prst1/driver.py
@@ -51,10 +51,10 @@ class PRST1(USBMS):
 
     VENDOR_NAME        = 'SONY'
     WINDOWS_MAIN_MEM   = re.compile(
-            r'(PRS-T(1|2|2N)&)'
+            r'(PRS-T(1|2|2N|3)&)'
             )
     WINDOWS_CARD_A_MEM = re.compile(
-            r'(PRS-T(1|2|2N)_{1,2}SD&)'
+            r'(PRS-T(1|2|2N|3)_{1,2}SD&)'
             )
     MAIN_MEMORY_VOLUME_LABEL = 'SONY Reader Main Memory'
     STORAGE_CARD_VOLUME_LABEL = 'SONY Reader Storage Card'