Index: uspace/drv/bus/usb/usbmast/main.c
===================================================================
--- uspace/drv/bus/usb/usbmast/main.c	(revision da904f78faa90988c60cd91d2c9b77264bca5d44)
+++ uspace/drv/bus/usb/usbmast/main.c	(revision dd8b6a87925c4db039bcd5d96da488ee67d92e29)
@@ -85,4 +85,5 @@
 static int usbmast_bd_close(bd_srv_t *);
 static int usbmast_bd_read_blocks(bd_srv_t *, aoff64_t, size_t, void *, size_t);
+static int usbmast_bd_sync_cache(bd_srv_t *, aoff64_t, size_t);
 static int usbmast_bd_write_blocks(bd_srv_t *, aoff64_t, size_t, const void *, size_t);
 static int usbmast_bd_get_block_size(bd_srv_t *, size_t *);
@@ -93,4 +94,5 @@
 	.close = usbmast_bd_close,
 	.read_blocks = usbmast_bd_read_blocks,
+	.sync_cache = usbmast_bd_sync_cache,
 	.write_blocks = usbmast_bd_write_blocks,
 	.get_block_size = usbmast_bd_get_block_size,
@@ -338,4 +340,12 @@
 }
 
+/** Synchronize blocks to nonvolatile storage. */
+static int usbmast_bd_sync_cache(bd_srv_t *bd, uint64_t ba, size_t cnt)
+{
+	usbmast_fun_t *mfun = bd_srv_usbmast(bd);
+
+	return usbmast_sync_cache(mfun, ba, cnt);
+}
+
 /** Write blocks to the device. */
 static int usbmast_bd_write_blocks(bd_srv_t *bd, uint64_t ba, size_t cnt,
Index: uspace/drv/bus/usb/usbmast/scsi_ms.c
===================================================================
--- uspace/drv/bus/usb/usbmast/scsi_ms.c	(revision da904f78faa90988c60cd91d2c9b77264bca5d44)
+++ uspace/drv/bus/usb/usbmast/scsi_ms.c	(revision dd8b6a87925c4db039bcd5d96da488ee67d92e29)
@@ -383,4 +383,51 @@
 }
 
+/** Perform SCSI Synchronize Cache command on USB mass storage device.
+ *
+ * @param mfun		Mass storage function
+ * @param ba		Address of first block
+ * @param nblocks	Number of blocks to read
+ * @param data		Data to write
+ *
+ * @return		Error code
+ */
+int usbmast_sync_cache(usbmast_fun_t *mfun, uint64_t ba, size_t nblocks)
+{
+	scsi_cmd_t cmd;
+	scsi_cdb_sync_cache_10_t cdb;
+	int rc;
+
+	if (ba > UINT32_MAX)
+		return ELIMIT;
+
+	if (nblocks > UINT16_MAX)
+		return ELIMIT;
+
+	memset(&cdb, 0, sizeof(cdb));
+	cdb.op_code = SCSI_CMD_SYNC_CACHE_10;
+	cdb.lba = host2uint32_t_be(ba);
+	cdb.numlb = host2uint16_t_be(nblocks);
+
+	memset(&cmd, 0, sizeof(cmd));
+	cmd.cdb = &cdb;
+	cmd.cdb_size = sizeof(cdb);
+
+	rc = usbmast_run_cmd(mfun, &cmd);
+
+        if (rc != EOK) {
+		usb_log_error("Synchronize Cache (10) transport failed, device %s: %s.\n",
+		   ddf_dev_get_name(mfun->mdev->ddf_dev), str_error(rc));
+		return rc;
+	}
+
+	if (cmd.status != CMDS_GOOD) {
+		usb_log_error("Synchronize Cache (10) command failed, device %s.\n",
+		   ddf_dev_get_name(mfun->mdev->ddf_dev));
+		return EIO;
+	}
+
+	return EOK;
+}
+
 /**
  * @}
Index: uspace/drv/bus/usb/usbmast/scsi_ms.h
===================================================================
--- uspace/drv/bus/usb/usbmast/scsi_ms.h	(revision da904f78faa90988c60cd91d2c9b77264bca5d44)
+++ uspace/drv/bus/usb/usbmast/scsi_ms.h	(revision dd8b6a87925c4db039bcd5d96da488ee67d92e29)
@@ -64,4 +64,5 @@
 extern int usbmast_read(usbmast_fun_t *, uint64_t, size_t, void *);
 extern int usbmast_write(usbmast_fun_t *, uint64_t, size_t, const void *);
+extern int usbmast_sync_cache(usbmast_fun_t *, uint64_t, size_t);
 extern const char *usbmast_scsi_dev_type_str(unsigned);