diff --git a/ce/Makefile b/ce/Makefile
index bef00fc..f18e1e3 100644
--- a/ce/Makefile
+++ b/ce/Makefile
@@ -6,6 +6,7 @@ $(eval $(call add_lib,libaux))
 $(eval $(call add_lib,libarena))
 $(eval $(call add_lib,libioutil))
 $(eval $(call add_lib,libterminal))
+$(eval $(call add_lib,libfat))
 $(eval $(call add_include,libkb))
 
 cflags += -DPRINTF_INCLUDE_CONFIG_H=1
diff --git a/ce/interp.c b/ce/interp.c
index 44490c6..27121e8 100644
--- a/ce/interp.c
+++ b/ce/interp.c
@@ -11,6 +11,7 @@
 #include <fs_types.h>
 #include <kb.h>
 #include <liballoc.h>
+#include <libfat.h>
 #include <path.h>
 #include <printf.h>
 #include <process.h>
@@ -296,6 +297,30 @@ static void mkvol (struct context* context, const char* volume, const char* str_
     cprintf (context, "ERROR Could not create volume: %s\n", str_status[-ret]);
 }
 
+static void format (struct context* context, const char* device, const char* str_fs_type) {
+  int fs_type;
+
+  if (strcmp (str_fs_type, "tar") == 0) {
+    fs_type = FS_TARFS;
+  } else if (strcmp (str_fs_type, "fat16") == 0) {
+    fs_type = FS_FAT16;
+  } else if (strcmp (str_fs_type, "fat32") == 0) {
+    fs_type = FS_FAT32;
+  } else {
+    cprintf (context, "ERROR Unknown filesystem '%s'\n", str_fs_type);
+    return;
+  }
+
+  struct fatfs_ctx ctx;
+
+  int ret = fat_format_drive (&ctx, device, fs_type);
+
+  if (ret < 0)
+    cprintf (context, "ERROR Could not format drive: %s\n", str_status[-ret]);
+  else
+    cprintf (context, "OK\n");
+}
+
 static void help (struct context* context) {
   cprintf (context, "Available commands:\n");
   cprintf (context, "help\n");
@@ -337,7 +362,7 @@ static void execute_cmd (struct ast_cmd* cmd, struct context* context) {
     if (cmd->args[0] != NULL)
       ls (context, cmd->args[0]);
     else
-      cprintf (context, "No directory path provided\n");
+      cprintf (context, "ERROR No directory path provided\n");
   } else if (strcmp (cmd->name, "quit") == 0) {
     quit1 (context);
   } else if (strcmp (cmd->name, "mkfile") == 0) {
@@ -350,7 +375,7 @@ static void execute_cmd (struct ast_cmd* cmd, struct context* context) {
     if (cmd->args[0] != NULL)
       edit (context, cmd->args[0]);
     else
-      cprintf (context, "No file path provided\n");
+      cprintf (context, "ERROR No file path provided\n");
   } else if (strcmp (cmd->name, "terminfo") == 0) {
     terminfo (context);
   } else if (strcmp (cmd->name, "cls") == 0) {
@@ -359,7 +384,12 @@ static void execute_cmd (struct ast_cmd* cmd, struct context* context) {
     if ((cmd->args[0] != NULL) && (cmd->args[1] != NULL) && (cmd->args[2] != NULL))
       mkvol (context, cmd->args[0], cmd->args[1], cmd->args[2]);
     else
-      cprintf (context, "No volume key, filesystem type or device key provided\n");
+      cprintf (context, "ERROR No volume key, filesystem type or device key provided\n");
+  } else if (strcmp (cmd->name, "format") == 0) {
+    if ((cmd->args[0] != NULL) && (cmd->args[1] != NULL))
+      format (context, cmd->args[0], cmd->args[1]);
+    else
+      cprintf (context, "ERROR No device key or filesystem type provided\n");
   } else {
     char volume[VOLUME_MAX];
     const char* path;
diff --git a/libfat/Makefile b/libfat/Makefile
index 27f7797..00ce6c8 100644
--- a/libfat/Makefile
+++ b/libfat/Makefile
@@ -1,7 +1,7 @@
 include ../make/ufuncs.mk
 
 $(eval $(call add_include,libsystem))
-$(eval $(call add_lib,libstring))
+$(eval $(call add_include,libstring))
 
 cflags += -D"FAT_PRINTF(a)"
 
diff --git a/libfat/_fatctx.h b/libfat/_fatctx.h
index 08cd444..0033340 100644
--- a/libfat/_fatctx.h
+++ b/libfat/_fatctx.h
@@ -8,6 +8,7 @@ struct fatfs_ctx {
   struct fatfs _fs;
   struct fat_list _open_file_list;
   struct fat_list _free_file_list;
+  char device_name[0x100];
 };
 
 #endif // _KERNEL_FS_FATFS_CTX_H
diff --git a/libfat/libfat.c b/libfat/libfat.c
index 2ac9f0a..22c73cc 100644
--- a/libfat/libfat.c
+++ b/libfat/libfat.c
@@ -1,3 +1,103 @@
+#include <devices.h>
+#include <fs_types.h>
 #include <libfat.h>
+#include <status.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <string.h>
+#include <system.h>
 
-int a;
+static void translate (size_t fs_block, size_t fs_block_count, size_t fs_block_size,
+                       size_t device_sector_size, size_t* out_phys_sector,
+                       size_t* out_sector_count) {
+  size_t ratio = fs_block_size / device_sector_size;
+
+  if (out_phys_sector != NULL)
+    *out_phys_sector = fs_block * ratio;
+
+  if (out_sector_count != NULL)
+    *out_sector_count = fs_block_count * ratio;
+}
+
+static int fat_diskio_read (struct fatfs_ctx* ctx, uint32_t sector, uint8_t* buffer,
+                            uint32_t sector_count) {
+  (void)ctx;
+
+  int ret;
+  size_t sector_size;
+  size_t phys_sector, phys_sector_count;
+
+  if (sector_count == 0)
+    return 0;
+
+  if ((ret = device_do (ctx->device_name, XDRV_GET_SECTOR_SIZE, &sector_size, NULL, NULL, NULL)) <
+      0)
+    return 0;
+
+  translate (sector, sector_count, FAT_SECTOR_SIZE, sector_size, &phys_sector, &phys_sector_count);
+
+  if ((ret = device_do (ctx->device_name, XDRV_READ, &phys_sector, &phys_sector_count, buffer,
+                        NULL)) < 0)
+    return 0;
+
+  return 1;
+}
+
+static int fat_diskio_write (struct fatfs_ctx* ctx, uint32_t sector, uint8_t* buffer,
+                             uint32_t sector_count) {
+  (void)ctx;
+
+  int ret;
+  size_t sector_size;
+  size_t phys_sector, phys_sector_count;
+
+  if (sector_count == 0)
+    return 0;
+
+  if ((ret = device_do (ctx->device_name, XDRV_GET_SECTOR_SIZE, &sector_size, NULL, NULL, NULL)) <
+      0)
+    return 0;
+
+  translate (sector, sector_count, FAT_SECTOR_SIZE, sector_size, &phys_sector, &phys_sector_count);
+
+  if ((ret = device_do (ctx->device_name, XDRV_WRITE, &phys_sector, &phys_sector_count, buffer,
+                        NULL)) < 0)
+    return 0;
+
+  return 1;
+}
+
+int fat_format_drive (struct fatfs_ctx* ctx, const char* device_key, int fs_type) {
+  memset (ctx, 0, sizeof (*ctx));
+  memcpy (ctx->device_name, device_key, sizeof (ctx->device_name) - 1);
+
+  size_t total_size = 0;
+  device_do (device_key, XDRV_GET_SIZE, &total_size, NULL, NULL, NULL);
+
+  if (total_size == 0)
+    return -ST_NOT_FOUND;
+
+  size_t sectors = ((total_size + FAT_SECTOR_SIZE) / FAT_SECTOR_SIZE);
+
+  fl_init (ctx);
+  ctx->_fs.disk_io.read_media = &fat_diskio_read;
+  ctx->_fs.disk_io.write_media = &fat_diskio_write;
+
+  int r = -1;
+
+  switch (fs_type) {
+  case FS_FAT16:
+    r = fatfs_format_fat16 (ctx, &ctx->_fs, sectors, "mop3 fat16");
+    break;
+  case FS_FAT32:
+    r = fatfs_format_fat32 (ctx, &ctx->_fs, sectors, "mop3 fat32");
+    break;
+  default:
+    break;
+  }
+
+  if (r < 0)
+    return -ST_FORMAT_ERROR;
+
+  return ST_OK;
+}
diff --git a/libfat/libfat.h b/libfat/libfat.h
index 27e085b..6413f0c 100644
--- a/libfat/libfat.h
+++ b/libfat/libfat.h
@@ -1,4 +1,9 @@
 #ifndef _LIBFAT_LIBFAT_H
 #define _LIBFAT_LIBFAT_H
 
+#include <_fat.h>
+#include <_fatctx.h>
+
+int fat_format_drive (struct fatfs_ctx* ctx, const char* device_key, int fs_type);
+
 #endif // _LIBFAT_LIBFAT_H