Zero is a counting number. 0->255 == 1->256.
On Fri, 23 Feb 2001, David Balazic wrote:

> Running kernel 2.4.2 :
> 
> cat /proc/ide/hdc/settings
> 
> name                    value           min             max             mode
> ----                    -----           ---             ---             ----
> bios_cyl                89355           0               65535           rw
> bios_head               16              0               255             rw
> bios_sect               63              0               63              rw
> breada_readahead        4               0               127             rw
> bswap                   0               0               1               r
> current_speed           69              0               69              rw
> file_readahead          0               0               2097151         rw
> ide_scsi                0               0               1               rw
> init_speed              12              0               69              rw
> io_32bit                1               0               3               rw
> keepsettings            0               0               1               rw
> lun                     0               0               7               rw
> max_kb_per_request      128             1               127             rw
> multcount               0               0               8               rw
> nice1                   1               0               1               rw
> nowerr                  0               0               1               rw
> number                  2               0               3               rw
> pio_mode                write-only      0               255             w
> slow                    0               0               1               rw
> unmaskirq               1               0               1               rw
> using_dma      
> --------------------%X---------------
> 
> max_kb_per_request  has value 128 , but max is 127 !?
> 
> max for multcount is 8 , but my drive supports 16 sectors. ( see hdparm output below 
>)
> If I set multcount to 8 sectors ( hdparm -m 8 /dev/hdc ) 
> then /proc/ide/hdc/settings will show :
> multcount               4               0               8               rw
> 
> The values are divided by 2. Why ?
> 
> 
> hdparm -i /dev/hdc  :
> 
> /dev/hdc:
> 
>  Model=IBM-DTLA-307045, FwRev=TX6OA60A, SerialNo=YMEYMML9342
>  Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
>  RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=40
>  BuffType=DualPortCache, BuffSize=1916kB, MaxMultSect=16, MultSect=off
>  CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=90069840
>  IORDY=on/off, tPIO={min:240,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes: pio0 pio1 pio2 pio3 pio4 
>  DMA modes: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 
> 
> IDE interface is VIA xxx686b ( ATA-100 )
> IDE driver is VIA IDE v4.3
> 
> -- 
> David Balazic
> --------------
> "Be excellent to each other." - Bill & Ted
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Andre Hedrick
Linux ATA Development
ASL Kernel Development
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