diff --git a/block.c b/block.c
index 3cb3cc22dc..8ec86adda5 100644
--- a/block.c
+++ b/block.c
@@ -717,7 +717,7 @@ int64_t bdrv_getlength(BlockDriverState *bs)
 }
 
 /* return 0 as number of sectors if no device present or error */
-void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr)
+void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
 {
     int64_t length;
     length = bdrv_getlength(bs);
diff --git a/block.h b/block.h
index f98639a89a..69cfbb632b 100644
--- a/block.h
+++ b/block.h
@@ -72,7 +72,7 @@ int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
                 const void *buf, int count);
 int bdrv_truncate(BlockDriverState *bs, int64_t offset);
 int64_t bdrv_getlength(BlockDriverState *bs);
-void bdrv_get_geometry(BlockDriverState *bs, int64_t *nb_sectors_ptr);
+void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr);
 int bdrv_commit(BlockDriverState *bs);
 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size);
 /* async block I/O */
diff --git a/hw/fdc.c b/hw/fdc.c
index 868ae076a4..e5f46d086e 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -234,7 +234,7 @@ static const fd_format_t fd_formats[] = {
 static void fd_revalidate (fdrive_t *drv)
 {
     const fd_format_t *parse;
-    int64_t nb_sectors, size;
+    uint64_t nb_sectors, size;
     int i, first_match, match;
     int nb_heads, max_track, last_sect, ro;
 
diff --git a/hw/ide.c b/hw/ide.c
index 18431e7a33..bc82bb21d1 100644
--- a/hw/ide.c
+++ b/hw/ide.c
@@ -1465,12 +1465,12 @@ static void ide_atapi_cmd(IDEState *s)
         break;
     case GPCMD_SEEK:
         {
-            int lba;
-            int64_t total_sectors;
+            unsigned int lba;
+            uint64_t total_sectors;
 
             bdrv_get_geometry(s->bs, &total_sectors);
             total_sectors >>= 2;
-            if (total_sectors <= 0) {
+            if (total_sectors == 0) {
                 ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                     ASC_MEDIUM_NOT_PRESENT);
                 break;
@@ -1516,11 +1516,11 @@ static void ide_atapi_cmd(IDEState *s)
     case GPCMD_READ_TOC_PMA_ATIP:
         {
             int format, msf, start_track, len;
-            int64_t total_sectors;
+            uint64_t total_sectors;
 
             bdrv_get_geometry(s->bs, &total_sectors);
             total_sectors >>= 2;
-            if (total_sectors <= 0) {
+            if (total_sectors == 0) {
                 ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                     ASC_MEDIUM_NOT_PRESENT);
                 break;
@@ -1560,11 +1560,11 @@ static void ide_atapi_cmd(IDEState *s)
         break;
     case GPCMD_READ_CDVD_CAPACITY:
         {
-            int64_t total_sectors;
+            uint64_t total_sectors;
 
             bdrv_get_geometry(s->bs, &total_sectors);
             total_sectors >>= 2;
-            if (total_sectors <= 0) {
+            if (total_sectors == 0) {
                 ide_atapi_cmd_error(s, SENSE_NOT_READY,
                                     ASC_MEDIUM_NOT_PRESENT);
                 break;
@@ -1580,7 +1580,7 @@ static void ide_atapi_cmd(IDEState *s)
             int media = packet[1];
             int layer = packet[6];
             int format = packet[2];
-            int64_t total_sectors;
+            uint64_t total_sectors;
 
             if (media != 0 || layer != 0)
             {
@@ -1592,6 +1592,11 @@ static void ide_atapi_cmd(IDEState *s)
                 case 0:
                     bdrv_get_geometry(s->bs, &total_sectors);
                     total_sectors >>= 2;
+                    if (total_sectors == 0) {
+                        ide_atapi_cmd_error(s, SENSE_NOT_READY,
+                                            ASC_MEDIUM_NOT_PRESENT);
+                        break;
+                    }
 
                     memset(buf, 0, 2052);
 
@@ -1636,7 +1641,7 @@ static void ide_atapi_cmd(IDEState *s)
         break;
     case GPCMD_GET_CONFIGURATION:
         {
-            int64_t total_sectors;
+            uint64_t total_sectors;
 
             /* only feature 0 is supported */
             if (packet[2] != 0 || packet[3] != 0) {
@@ -1721,7 +1726,7 @@ static void ide_cfata_metadata_write(IDEState *s)
 static void cdrom_change_cb(void *opaque)
 {
     IDEState *s = opaque;
-    int64_t nb_sectors;
+    uint64_t nb_sectors;
 
     /* XXX: send interrupt too */
     bdrv_get_geometry(s->bs, &nb_sectors);
@@ -2417,7 +2422,7 @@ static void ide_init2(IDEState *ide_state,
     IDEState *s;
     static int drive_serial = 1;
     int i, cylinders, heads, secs, translation, lba_detected = 0;
-    int64_t nb_sectors;
+    uint64_t nb_sectors;
 
     for(i = 0; i < 2; i++) {
         s = ide_state + i;
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index d281b8cbba..220b1997cc 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -284,7 +284,7 @@ static int32_t scsi_send_command(SCSIDevice *d, uint32_t tag,
                                  uint8_t *buf, int lun)
 {
     SCSIDeviceState *s = d->state;
-    int64_t nb_sectors;
+    uint64_t nb_sectors;
     uint32_t lba;
     uint32_t len;
     int cmdlen;
diff --git a/qemu-img.c b/qemu-img.c
index f1a8aebf5e..2dffe8e3a4 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -235,7 +235,7 @@ static int img_create(int argc, char **argv)
     const char *fmt = "raw";
     const char *filename;
     const char *base_filename = NULL;
-    int64_t size;
+    uint64_t size;
     const char *p;
     BlockDriver *drv;
 
@@ -300,7 +300,7 @@ static int img_create(int argc, char **argv)
         printf(", backing_file=%s",
                base_filename);
     }
-    printf(", size=%" PRId64 " kB\n", (int64_t) (size / 1024));
+    printf(", size=%" PRIu64 " kB\n", size / 1024);
     ret = bdrv_create(drv, filename, size / 512, base_filename, flags);
     if (ret < 0) {
         if (ret == -ENOTSUP) {
@@ -410,7 +410,8 @@ static int img_convert(int argc, char **argv)
     const char *fmt, *out_fmt, *out_filename;
     BlockDriver *drv;
     BlockDriverState **bs, *out_bs;
-    int64_t total_sectors, nb_sectors, sector_num, bs_offset, bs_sectors;
+    int64_t total_sectors, nb_sectors, sector_num, bs_offset;
+    uint64_t bs_sectors;
     uint8_t buf[IO_BUF_SIZE];
     const uint8_t *buf1;
     BlockDriverInfo bdi;
@@ -655,7 +656,8 @@ static int img_info(int argc, char **argv)
     BlockDriver *drv;
     BlockDriverState *bs;
     char fmt_name[128], size_buf[128], dsize_buf[128];
-    int64_t total_sectors, allocated_size;
+    uint64_t total_sectors;
+    int64_t allocated_size;
     char backing_filename[1024];
     char backing_filename2[1024];
     BlockDriverInfo bdi;