diff --git a/src/calibre/devices/prs505/driver.py b/src/calibre/devices/prs505/driver.py
index 734c49edbb..bd06d2d7e1 100644
--- a/src/calibre/devices/prs505/driver.py
+++ b/src/calibre/devices/prs505/driver.py
@@ -28,6 +28,7 @@ class PRS505(USBMS):
 
 
     FORMATS      = ['epub', 'lrf', 'lrx', 'rtf', 'pdf', 'txt']
+    CAN_SET_METADATA = True
 
     VENDOR_ID    = [0x054c]   #: SONY Vendor Id
     PRODUCT_ID   = [0x031e]
diff --git a/src/calibre/devices/usbms/driver.py b/src/calibre/devices/usbms/driver.py
index 76996481a5..97c212775a 100644
--- a/src/calibre/devices/usbms/driver.py
+++ b/src/calibre/devices/usbms/driver.py
@@ -37,7 +37,7 @@ class USBMS(CLI, Device):
     book_class = Book
 
     FORMATS = []
-    CAN_SET_METADATA = True
+    CAN_SET_METADATA = False
     METADATA_CACHE = 'metadata.calibre'
 
     def get_device_information(self, end_session=True):