diff --git a/apps/debug_menu.c b/apps/debug_menu.c
index d761b9f868..08fc6e0da4 100644
--- a/apps/debug_menu.c
+++ b/apps/debug_menu.c
@@ -63,7 +63,7 @@
 #include "usb.h"
 #include "rtc.h"
 #include "storage.h"
-#include "fat.h"
+#include "fs_defines.h"
 #include "eeprom_24cxx.h"
 #if (CONFIG_STORAGE & STORAGE_MMC) || (CONFIG_STORAGE & STORAGE_SD)
 #include "sdmmc.h"
diff --git a/bootloader/gigabeat.c b/bootloader/gigabeat.c
index a79454b81d..005d33630f 100644
--- a/bootloader/gigabeat.c
+++ b/bootloader/gigabeat.c
@@ -29,7 +29,6 @@
 #include "lcd.h"
 #include "../kernel-internal.h"
 #include "storage.h"
-#include "fat.h"
 #include "file_internal.h"
 #include "disk.h"
 #include "font.h"
diff --git a/bootloader/ipod.c b/bootloader/ipod.c
index 8580886ce4..8e5bd08a42 100644
--- a/bootloader/ipod.c
+++ b/bootloader/ipod.c
@@ -32,7 +32,6 @@
 #include "lcd.h"
 #include "../kernel-internal.h"
 #include "ata.h"
-#include "fat.h"
 #include "file_internal.h"
 #include "disk.h"
 #include "font.h"
diff --git a/bootloader/ipod6g.c b/bootloader/ipod6g.c
index 0ab9444578..0d0a4c53d1 100644
--- a/bootloader/ipod6g.c
+++ b/bootloader/ipod6g.c
@@ -32,7 +32,6 @@
 #include "../kernel-internal.h"
 #include "file_internal.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "backlight.h"
diff --git a/bootloader/ipodnano2g.c b/bootloader/ipodnano2g.c
index d0a8e0206c..85bb2df86d 100644
--- a/bootloader/ipodnano2g.c
+++ b/bootloader/ipodnano2g.c
@@ -34,7 +34,6 @@
 #include "../kernel-internal.h"
 #include "file_internal.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "backlight.h"
diff --git a/bootloader/meizu_m3.c b/bootloader/meizu_m3.c
index cefb186ef4..61308349f6 100644
--- a/bootloader/meizu_m3.c
+++ b/bootloader/meizu_m3.c
@@ -32,7 +32,6 @@
 #include "lcd.h"
 #include "../kernel-internal.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "backlight.h"
diff --git a/bootloader/meizu_m6sl.c b/bootloader/meizu_m6sl.c
index c230ec3c08..073c57cb0d 100644
--- a/bootloader/meizu_m6sl.c
+++ b/bootloader/meizu_m6sl.c
@@ -30,7 +30,6 @@
 #include "kernel.h"
 #include "thread.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "adc.h"
diff --git a/bootloader/meizu_m6sp.c b/bootloader/meizu_m6sp.c
index c57fe91b22..0a6dc274d9 100644
--- a/bootloader/meizu_m6sp.c
+++ b/bootloader/meizu_m6sp.c
@@ -30,7 +30,6 @@
 #include "kernel.h"
 #include "thread.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "button.h"
diff --git a/bootloader/mini2440.c b/bootloader/mini2440.c
index 4088065550..2bdd1a0f41 100644
--- a/bootloader/mini2440.c
+++ b/bootloader/mini2440.c
@@ -30,7 +30,6 @@
 #include "../kernel-internal.h"
 #include "storage.h"
 #include "file_internal.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "backlight.h"
diff --git a/bootloader/mrobe500.c b/bootloader/mrobe500.c
index 08ba6f2acd..e3d59051a1 100644
--- a/bootloader/mrobe500.c
+++ b/bootloader/mrobe500.c
@@ -27,7 +27,6 @@
 #include "../kernel-internal.h"
 #include "storage.h"
 #include "file_internal.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "adc.h"
diff --git a/bootloader/sansaview.c b/bootloader/sansaview.c
index 7ea4b59250..31716d4b25 100644
--- a/bootloader/sansaview.c
+++ b/bootloader/sansaview.c
@@ -35,7 +35,6 @@ SANSA VIEW: TESTING CODE
 #include "lcd.h"
 #include "../kernel-internal.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "backlight.h"
diff --git a/bootloader/telechips.c b/bootloader/telechips.c
index 879e72ad65..c69a6da42c 100644
--- a/bootloader/telechips.c
+++ b/bootloader/telechips.c
@@ -31,7 +31,6 @@
 #include "../kernel-internal.h"
 #include "storage.h"
 #include "file_internal.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "button.h"
diff --git a/bootloader/tpj1022.c b/bootloader/tpj1022.c
index 30adb6ba4e..3590c7882d 100644
--- a/bootloader/tpj1022.c
+++ b/bootloader/tpj1022.c
@@ -32,7 +32,6 @@
 #include "thread.h"
 #include "storage.h"
 #include "file_internal.h"
-#include "fat.h"
 #include "disk.h"
 #include "font.h"
 #include "panic.h"
diff --git a/firmware/common/disk_cache.c b/firmware/common/disk_cache.c
index 0e842e7796..9e4dee6a91 100644
--- a/firmware/common/disk_cache.c
+++ b/firmware/common/disk_cache.c
@@ -23,7 +23,7 @@
 #include "system.h"
 #include "linked_list.h"
 #include "disk_cache.h"
-#include "fat.h" /* for SECTOR_SIZE */
+#include "fs_defines.h"
 #include "bitarray.h"
 
 /* Cache: LRU cache with separately-chained hashtable
diff --git a/firmware/drivers/ata.c b/firmware/drivers/ata.c
index b98567e8bf..b574117620 100644
--- a/firmware/drivers/ata.c
+++ b/firmware/drivers/ata.c
@@ -34,10 +34,9 @@
 #include "ata_idle_notify.h"
 #include "ata-driver.h"
 #include "ata-defines.h"
+#include "fs_defines.h"
 #include "storage.h"
 
-#define SECTOR_SIZE     512
-
 #define SELECT_DEVICE1  0x10
 #define SELECT_LBA      0x40
 
diff --git a/firmware/export/fat.h b/firmware/export/fat.h
index 963c1fe767..b8092290e6 100644
--- a/firmware/export/fat.h
+++ b/firmware/export/fat.h
@@ -48,14 +48,6 @@
 #define FAT_MAX_TRANSFER_SIZE 256
 #endif
 
-/* still experimental? */
-/* increasing this will increase the total memory used by the cache; the
-   cache, as noted in disk_cache.h, has other minimum requirements that may
-   prevent reducing its number of entries in order to compensate */
-#ifndef SECTOR_SIZE
-#define SECTOR_SIZE 512
-#endif
-
 /**
  ****************************************************************************/
 
diff --git a/firmware/include/disk_cache.h b/firmware/include/disk_cache.h
index 725b3778cc..79b2ccf2c6 100644
--- a/firmware/include/disk_cache.h
+++ b/firmware/include/disk_cache.h
@@ -21,29 +21,6 @@
 #ifndef DISK_CACHE_H
 #define DISK_CACHE_H
 
-/* This needs enough for all file handles to have a buffer in the worst case
- * plus at least one reserved exclusively for the cache client and a couple
- * for other file system code. The buffers are put to use by the cache if not
- * taken for another purpose (meaning nothing is wasted sitting fallow).
- *
- * One map per volume is maintained in order to avoid collisions between
- * volumes that would slow cache probing. DC_MAP_NUM_ENTRIES is the number
- * for each map per volume. The buffers themselves are shared.
- */
-#if MEMORYSIZE < 8
-#define DC_NUM_ENTRIES      32
-#define DC_MAP_NUM_ENTRIES  128
-#elif MEMORYSIZE <= 32
-#define DC_NUM_ENTRIES      48
-#define DC_MAP_NUM_ENTRIES  128
-#else /* MEMORYSIZE > 32 */
-#define DC_NUM_ENTRIES      64
-#define DC_MAP_NUM_ENTRIES  256
-#endif /* MEMORYSIZE */
-
-/* this _could_ be larger than a sector if that would ever be useful */
-#define DC_CACHE_BUFSIZE    SECTOR_SIZE
-
 #include "mutex.h"
 #include "mv.h"
 
diff --git a/firmware/include/file_internal.h b/firmware/include/file_internal.h
index 5893737833..d62b5a8541 100644
--- a/firmware/include/file_internal.h
+++ b/firmware/include/file_internal.h
@@ -28,55 +28,14 @@
 #include "mutex.h"
 #include "mrsw_lock.h"
 #include "fs_attr.h"
+#include "fs_defines.h"
 #include "fat.h"
 #ifdef HAVE_DIRCACHE
 #include "dircache.h"
 #endif
 
-/** Tuneable parameters **/
-
-/* limits for number of open descriptors - if you increase these values, make
-   certain that the disk cache has enough available buffers */
-#define MAX_OPEN_FILES 11
-#define MAX_OPEN_DIRS  12
 #define MAX_OPEN_HANDLES (MAX_OPEN_FILES+MAX_OPEN_DIRS)
 
-/* internal functions open streams as well; make sure they don't fail if all
-   user descs are busy; this needs to be at least the greatest quantity needed
-   at once by all internal functions */
-#ifdef HAVE_DIRCACHE
-#define AUX_FILEOBJS 3
-#else
-#define AUX_FILEOBJS 2
-#endif
-
-/* number of components statically allocated to handle the vast majority
-   of path depths; should maybe be tuned for >= 90th percentile but for now,
-   imma just guessing based on something like:
-        root + 'Music' + 'Artist' + 'Album' + 'Disc N' + filename */
-#define STATIC_PATHCOMP_NUM 6
-
-#define MAX_COMPNAME    260
-
-/* unsigned value that will also hold the off_t range we need without
-   overflow */
-#define file_size_t uint32_t
-
-#ifdef __USE_FILE_OFFSET64
-/* if we want, we can deal with files up to 2^32-1 bytes-- the full FAT16/32
-   range */
-#define FILE_SIZE_MAX   (0xffffffffu)
-#else
-/* file contents and size will be preserved by the APIs so long as ftruncate()
-   isn't used; bytes passed 2^31-1 will not accessible nor will writes succeed
-   that would extend the file beyond the max for a 32-bit off_t */
-#define FILE_SIZE_MAX   (0x7fffffffu)
-#endif
-
-/* if file is "large(ish)", then get rid of the contents now rather than
-   lazily when the file is synced or closed in order to free-up space */
-#define O_TRUNC_THRESH 65536
-
 /* default attributes when creating new files and directories */
 #define ATTR_NEW_FILE       (ATTR_ARCHIVE)
 #define ATTR_NEW_DIRECTORY  (ATTR_DIRECTORY)
diff --git a/firmware/include/fs_defines.h b/firmware/include/fs_defines.h
new file mode 100644
index 0000000000..538c4b36cd
--- /dev/null
+++ b/firmware/include/fs_defines.h
@@ -0,0 +1,108 @@
+/***************************************************************************
+ *             __________               __   ___.
+ *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
+ *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
+ *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
+ *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
+ *                     \/            \/     \/    \/            \/
+ * $Id$
+ *
+ * Copyright (C) 2017 by Michael Sevakis
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ****************************************************************************/
+#ifndef FS_DEFINES_H
+#define FS_DEFINES_H
+
+/** Tuneable parameters **/
+
+#if 0
+/* Define this just in case you're doing something that may crash a lot and
+   want less write caching */
+#define FS_MIN_WRITECACHING
+#endif
+
+#ifndef MAX_PATH
+#define MAX_PATH        260
+#endif
+
+#define MAX_COMPNAME    260
+
+/* still experimental? */
+/* increasing this will increase the total memory used by the cache; the
+   cache, as noted in disk_cache.h, has other minimum requirements that may
+   prevent reducing its number of entries in order to compensate */
+#ifndef SECTOR_SIZE
+#define SECTOR_SIZE     512
+#endif
+
+/* limits for number of open descriptors - if you increase these values, make
+   certain that the disk cache has enough available buffers */
+#define MAX_OPEN_FILES  11
+#define MAX_OPEN_DIRS   12
+
+/* internal functions open streams as well; make sure they don't fail if all
+   user descs are busy; this needs to be at least the greatest quantity needed
+   at once by all internal functions */
+#ifdef HAVE_DIRCACHE
+#define AUX_FILEOBJS 3
+#else
+#define AUX_FILEOBJS 2
+#endif
+
+/* number of components statically allocated to handle the vast majority
+   of path depths; should maybe be tuned for >= 90th percentile but for now,
+   imma just guessing based on something like:
+        root + 'Music' + 'Artist' + 'Album' + 'Disc N' + filename */
+#define STATIC_PATHCOMP_NUM 6
+
+/* unsigned value that will also hold the off_t range we need without
+   overflow */
+#define file_size_t uint32_t
+
+#ifdef __USE_FILE_OFFSET64
+/* if we want, we can deal with files up to 2^32-1 bytes-- the full FAT16/32
+   range */
+#define FILE_SIZE_MAX   (0xffffffffu)
+#else
+/* file contents and size will be preserved by the APIs so long as ftruncate()
+   isn't used; bytes passed 2^31-1 will not accessible nor will writes succeed
+   that would extend the file beyond the max for a 32-bit off_t */
+#define FILE_SIZE_MAX   (0x7fffffffu)
+#endif
+
+/* if file is "large(ish)", then get rid of the contents now rather than
+   lazily when the file is synced or closed in order to free-up space */
+#define O_TRUNC_THRESH 65536
+
+/* This needs enough for all file handles to have a buffer in the worst case
+ * plus at least one reserved exclusively for the cache client and a couple
+ * for other file system code. The buffers are put to use by the cache if not
+ * taken for another purpose (meaning nothing is wasted sitting fallow).
+ *
+ * One map per volume is maintained in order to avoid collisions between
+ * volumes that would slow cache probing. IOC_MAP_NUM_ENTRIES is the number
+ * for each map per volume. The buffers themselves are shared.
+ */
+#if MEMORYSIZE < 8
+#define DC_NUM_ENTRIES      32
+#define DC_MAP_NUM_ENTRIES  128
+#elif MEMORYSIZE <= 32
+#define DC_NUM_ENTRIES      48
+#define DC_MAP_NUM_ENTRIES  128
+#else /* MEMORYSIZE > 32 */
+#define DC_NUM_ENTRIES      64
+#define DC_MAP_NUM_ENTRIES  256
+#endif /* MEMORYSIZE */
+
+/* this _could_ be larger than a sector if that would ever be useful */
+#define DC_CACHE_BUFSIZE    SECTOR_SIZE
+
+#endif /* FS_DEFINES_H */
diff --git a/firmware/target/arm/as3525/sd-as3525.c b/firmware/target/arm/as3525/sd-as3525.c
index 4530d5d763..e65a7525b6 100644
--- a/firmware/target/arm/as3525/sd-as3525.c
+++ b/firmware/target/arm/as3525/sd-as3525.c
@@ -23,7 +23,7 @@
 /* Driver for the ARM PL180 SD/MMC controller inside AS3525 SoC */
 
 #include "config.h" /* for HAVE_MULTIDRIVE & AMS_OF_SIZE */
-#include "fat.h"
+#include "fs_defines.h"
 #include "thread.h"
 #include "led.h"
 #include "sdmmc.h"
diff --git a/firmware/target/arm/as3525/sd-as3525v2.c b/firmware/target/arm/as3525/sd-as3525v2.c
index dec36a520d..3f39629e0b 100644
--- a/firmware/target/arm/as3525/sd-as3525v2.c
+++ b/firmware/target/arm/as3525/sd-as3525v2.c
@@ -21,7 +21,7 @@
  ****************************************************************************/
 
 #include "config.h" /* for HAVE_MULTIVOLUME */
-#include "fat.h"
+#include "fs_defines.h"
 #include "thread.h"
 #include "gcc_extensions.h"
 #include "led.h"
diff --git a/firmware/target/arm/ata-nand-telechips.c b/firmware/target/arm/ata-nand-telechips.c
index b8e572068c..869a53c1ef 100644
--- a/firmware/target/arm/ata-nand-telechips.c
+++ b/firmware/target/arm/ata-nand-telechips.c
@@ -28,8 +28,7 @@
 #include "panic.h"
 #include "nand_id.h"
 #include "storage.h"
-
-#define SECTOR_SIZE 512
+#include "fs_defines.h"
 
 /* ECC on read is implemented on the assumption that MLC-style 4-bit correction
    is always used regardless of NAND chip type. This assumption is true for at
diff --git a/firmware/target/arm/imx233/nand-imx233.c b/firmware/target/arm/imx233/nand-imx233.c
index 22c4fc2748..a7afba7d43 100644
--- a/firmware/target/arm/imx233/nand-imx233.c
+++ b/firmware/target/arm/imx233/nand-imx233.c
@@ -23,7 +23,7 @@
 #include "gpmi-imx233.h"
 #include "pinctrl-imx233.h"
 #include "button-target.h"
-#include "fat.h"
+#include "fs_defines.h"
 #include "disk.h"
 #include "usb.h"
 #include "debug.h"
diff --git a/firmware/target/arm/imx233/sdmmc-imx233.c b/firmware/target/arm/imx233/sdmmc-imx233.c
index 28310fbfd1..d3dabafecb 100644
--- a/firmware/target/arm/imx233/sdmmc-imx233.c
+++ b/firmware/target/arm/imx233/sdmmc-imx233.c
@@ -27,7 +27,6 @@
 #include "pinctrl-imx233.h"
 #include "partitions-imx233.h"
 #include "button-target.h"
-#include "fat.h"
 #include "disk.h"
 #include "usb.h"
 #include "debug.h"
diff --git a/firmware/target/arm/pnx0101/iriver-ifp7xx/usb-ifp7xx.c b/firmware/target/arm/pnx0101/iriver-ifp7xx/usb-ifp7xx.c
index 2f3c4189e5..0bfcdf3b1a 100644
--- a/firmware/target/arm/pnx0101/iriver-ifp7xx/usb-ifp7xx.c
+++ b/firmware/target/arm/pnx0101/iriver-ifp7xx/usb-ifp7xx.c
@@ -25,7 +25,6 @@
 #include "system.h"
 #include "debug.h"
 #include "ata.h"
-#include "fat.h"
 #include "disk.h"
 #include "panic.h"
 #include "lcd.h"
diff --git a/firmware/target/arm/pp/ata-sd-pp.c b/firmware/target/arm/pp/ata-sd-pp.c
index 2a11b40fee..edb806ab96 100644
--- a/firmware/target/arm/pp/ata-sd-pp.c
+++ b/firmware/target/arm/pp/ata-sd-pp.c
@@ -35,8 +35,8 @@
 #include "usb.h"
 #include "sd.h"
 #include "storage.h"
+#include "fs_defines.h"
 
-#define SECTOR_SIZE     512
 #define BLOCKS_PER_BANK 0x7a7800
 
 /* Comparing documentations of various MMC/SD controllers revealed, */
diff --git a/firmware/target/arm/tms320dm320/sdmmc-dm320.c b/firmware/target/arm/tms320dm320/sdmmc-dm320.c
index d46dbf5e40..a6e261bcfa 100644
--- a/firmware/target/arm/tms320dm320/sdmmc-dm320.c
+++ b/firmware/target/arm/tms320dm320/sdmmc-dm320.c
@@ -43,7 +43,6 @@
 #endif
 #include "sdmmc.h"
 #include "disk.h"
-#include "fat.h"
 #include "system-target.h"
 
 /* The configuration method is not very flexible. */
@@ -72,7 +71,6 @@
 #define UNALIGNED_NUM_SECTORS   10
 #define MAX_TRANSFER_ERRORS     10
 
-#define SECTOR_SIZE        512
 #define BLOCKS_PER_BANK    0x7A7800
 
 /* command flags for send_cmd */
diff --git a/firmware/usb.c b/firmware/usb.c
index ee6ed2c12c..5e3795dd48 100644
--- a/firmware/usb.c
+++ b/firmware/usb.c
@@ -30,7 +30,6 @@
 #include "system.h"
 #include "debug.h"
 #include "storage.h"
-#include "fat.h"
 #include "disk.h"
 #include "panic.h"
 #include "lcd.h"
diff --git a/firmware/usbstack/usb_storage.c b/firmware/usbstack/usb_storage.c
index 59ec191b4b..70587dfed4 100644
--- a/firmware/usbstack/usb_storage.c
+++ b/firmware/usbstack/usb_storage.c
@@ -27,7 +27,7 @@
 #include "logf.h"
 #include "storage.h"
 #include "disk.h"
-#include "fat.h"
+#include "fs_defines.h"
 /* Needed to get at the audio buffer */
 #include "audio.h"
 #include "usb_storage.h"
@@ -41,10 +41,6 @@
 #define RAMDISK_SIZE 2048
 #endif
 
-#ifndef SECTOR_SIZE
-#define SECTOR_SIZE 512
-#endif
-
 /* These defaults allow the operation */
 #ifndef USBSTOR_READ_SECTORS_FILTER
 #define USBSTOR_READ_SECTORS_FILTER() ({ 0; })