diff --git a/include/gint/hardware.h b/include/gint/hardware.h
index 60aa1dc..8e86b80 100644
--- a/include/gint/hardware.h
+++ b/include/gint/hardware.h
@@ -70,6 +70,7 @@ void hw_detect(void);
 #define HWKBD    8    /* Keyboard */
 #define HWKBDSF       /* Deprecated: use keysc_scan_frequency() */
 #define HWDD          /* Deprecated: use the T6K11/R61524 API */
+#define HWFS    11    /* Filesystem type */
 
 /*
 **  MPU type
@@ -118,6 +119,17 @@ void hw_detect(void);
 /* The keyboard uses a KEYSC-based scan method. This is only possible on SH4 */
 #define HWKBD_KSI      0x04
 
+/*
+**  Filesystem type
+*/
+
+/* Unknown or no filesystem. */
+#define HWFS_NONE        0
+/* CASIO's in-house filesystem, now deprecated. */
+#define HWFS_CASIOWIN    1
+/* Wrapper around Kyoto Software Research's Fugue VFAT implementation. */
+#define HWFS_FUGUE       2
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/src/kernel/hardware.c b/src/kernel/hardware.c
index 4fc8491..52b1da9 100644
--- a/src/kernel/hardware.c
+++ b/src/kernel/hardware.c
@@ -78,7 +78,15 @@ void hw_detect(void)
 	   be real, is enough for now.
 	   TODO: Try to detect Graph 35+E II from amount of ROM in BSC? */
 	char *version = (void *)0x80010020;
-	if(version[1] == '3') gint[HWCALC] = HWCALC_G35PE2;
+	if(version[1] == '3')
+	{
+		gint[HWCALC] = HWCALC_G35PE2;
+		gint[HWFS] = HWFS_FUGUE;
+	}
+	else
+	{
+		gint[HWFS] = HWFS_CASIOWIN;
+	}
 
 	/* Detect RAM by checking if 8804'0000 is the same as 8800'0000. */
 
@@ -121,7 +129,8 @@ void hw_detect(void)
 	/* Tell Prizms apart from fx-CG 50 by checking the stack address*/
 	uint32_t stack;
 	__asm__("mov r15, %0" : "=r"(stack));
-	gint[HWCALC]  = (stack < 0x8c000000) ? HWCALC_PRIZM : HWCALC_FXCG50;
+	gint[HWCALC] = (stack < 0x8c000000) ? HWCALC_PRIZM : HWCALC_FXCG50;
+	gint[HWFS] = HWFS_FUGUE;
 
 	/* Tell the fx-CG emulator apart using the product ID */
 	uint8_t *productID = (void *)0x8001ffd0;