diff --git a/src/usb/uf2/ghostfat.c b/src/usb/uf2/ghostfat.c
index 1f41c10..5ac475d 100644
--- a/src/usb/uf2/ghostfat.c
+++ b/src/usb/uf2/ghostfat.c
@@ -106,7 +106,7 @@ static FAT_BootBlock const BootBlock = {
     .FATCopies            = 2,
     .RootDirectoryEntries = (ROOT_DIR_SECTORS * 512 / 32),
     .TotalSectors16       = NUM_FAT_BLOCKS - 2,
-    .MediaDescriptor      = 0xF8,
+    .MediaDescriptor      = 0xF0,
     .SectorsPerFAT        = SECTORS_PER_FAT,
     .SectorsPerTrack      = 1,
     .Heads                = 1,