Options:
-a Get/set fs readahead
-A Set drive read-lookahead flag (0/1)
-b Get/set bus state (0 == off, 1 == on, 2 == tristate)
-B Set Advanced Power Management setting (1-255)
-c Get/set IDE 32-bit IO setting
-C Check IDE power mode status
-d Get/set using_dma flag
-D Enable/disable drive defect-mgmt
-f Flush buffer cache for device on exit
-g Display drive geometry
-h Display terse usage information
-i Display drive identification
-I Detailed/current information directly from drive
-k Get/set keep_settings_over_reset flag (0/1)
-K Set drive keep_features_over_reset flag (0/1)
-L Set drive doorlock (0/1) (removable harddisks only)
-m Get/set multiple sector count
-n Get/set ignore-write-errors flag (0/1)
-p Set PIO mode on IDE interface chipset (0,1,2,3,4,...)
-P Set drive prefetch count
-q Change next setting quietly
-Q Get/set DMA tagged-queuing depth (if supported)
-r Get/set readonly flag (DANGEROUS to set)
-R Register an IDE interface (DANGEROUS)
-S Set standby (spindown) timeout
-t Perform device read timings
-T Perform cache read timings
-u Get/set unmaskirq flag (0/1)
-U Un-register an IDE interface (DANGEROUS)
-v Defaults; same as -mcudkrag for IDE drives
-V Display program version and exit immediately
-w Perform device reset (DANGEROUS)
-W Set drive write-caching flag (0/1) (DANGEROUS)
-x Tristate device for hotswap (0/1) (DANGEROUS)
-X Set IDE xfer mode (DANGEROUS)
-y Put IDE drive in standby mode
-Y Put IDE drive to sleep
-Z Disable Seagate auto-powersaving mode
-z Re-read partition table