+`aio`=`(native | threads)` ;;
+
+AIO type to use.
+
+`backup`=`boolean` ;;
+
+Whether the drive should be included when making backups.
+
+`bps`=`<bps>` ;;
+
+Maximum r/w speed in bytes per second.
+
+`bps_max_length`=`<seconds>` ;;
+
+Maximum length of I/O bursts in seconds.
+
+`bps_rd`=`<bps>` ;;
+
+Maximum read speed in bytes per second.
+
+`bps_rd_length`=`<seconds>` ;;
+
+Maximum length of read I/O bursts in seconds.
+
+`bps_wr`=`<bps>` ;;
+
+Maximum write speed in bytes per second.
+
+`bps_wr_length`=`<seconds>` ;;
+
+Maximum length of write I/O bursts in seconds.
+
+`cache`=`(directsync | none | unsafe | writeback | writethrough)` ;;
+
+The drive's cache mode
+
+`cyls`=`integer` ;;
+
+Force the drive's physical geometry to have a specific cylinder count.
+
+`detect_zeroes`=`boolean` ;;
+
+Controls whether to detect and try to optimize writes of zeroes.
+
+`discard`=`(ignore | on)` ;;
+
+Controls whether to pass discard/trim requests to the underlying storage.
+
+`file`=`<volume>` ;;
+
+The drive's backing volume.
+
+`format`=`(cloop | cow | qcow | qcow2 | qed | raw | vmdk)` ;;
+
+The drive's backing file's data format.
+
+`heads`=`integer` ;;
+
+Force the drive's physical geometry to have a specific head count.
+
+`iops`=`<iops>` ;;
+
+Maximum r/w I/O in operations per second.
+
+`iops_max`=`<iops>` ;;
+
+Maximum unthrottled r/w I/O pool in operations per second.
+
+`iops_max_length`=`<seconds>` ;;
+
+Maximum length of I/O bursts in seconds.
+
+`iops_rd`=`<iops>` ;;
+
+Maximum read I/O in operations per second.
+
+`iops_rd_length`=`<seconds>` ;;
+
+Maximum length of read I/O bursts in seconds.
+
+`iops_rd_max`=`<iops>` ;;
+
+Maximum unthrottled read I/O pool in operations per second.
+
+`iops_wr`=`<iops>` ;;
+
+Maximum write I/O in operations per second.
+
+`iops_wr_length`=`<seconds>` ;;
+
+Maximum length of write I/O bursts in seconds.
+
+`iops_wr_max`=`<iops>` ;;
+
+Maximum unthrottled write I/O pool in operations per second.
+
+`mbps`=`<mbps>` ;;
+
+Maximum r/w speed in megabytes per second.
+
+`mbps_max`=`<mbps>` ;;
+
+Maximum unthrottled r/w pool in megabytes per second.
+
+`mbps_rd`=`<mbps>` ;;
+
+Maximum read speed in megabytes per second.
+
+`mbps_rd_max`=`<mbps>` ;;
+
+Maximum unthrottled read pool in megabytes per second.
+
+`mbps_wr`=`<mbps>` ;;
+
+Maximum write speed in megabytes per second.
+
+`mbps_wr_max`=`<mbps>` ;;
+
+Maximum unthrottled write pool in megabytes per second.
+
+`media`=`(cdrom | disk)` (default=`disk`);;
+
+The drive's media type.
+
+`model`=`<model>` ;;
+
+The drive's reported model name, url-encoded, up to 40 bytes long.
+
+`rerror`=`(ignore | report | stop)` ;;
+
+Read error action.
+
+`secs`=`integer` ;;
+
+Force the drive's physical geometry to have a specific sector count.
+
+`serial`=`<serial>` ;;
+
+The drive's reported serial number, url-encoded, up to 20 bytes long.
+
+`size`=`<DiskSize>` ;;
+
+Disk size. This is purely informational and has no effect.
+
+`snapshot`=`boolean` ;;
+
+Whether the drive should be included when making snapshots.
+
+`trans`=`(auto | lba | none)` ;;
+
+Force disk geometry bios translation mode.
+
+`werror`=`(enospc | ignore | report | stop)` ;;
+
+Write error action.
+