Re: Seagate ST340824A and (un)clipping max LBA: 2.2.19+ide04092001 patch

From: Alexander Stavitsky (astavitsky@yahoo.com)
Date: Mon Apr 30 2001 - 10:12:34 EST

On Sat, Apr 28, 2001 at 12:22:07AM +0200, Andries.Brouwer@cwi.nl wrote:

> No. Maybe someone can tell us about its origin, but in your case
> of course this just works because 0xa intersects 0x306b. You might
> comment out this entire test.

If I comment out the entire test, it would try to unclip the capacity of all
drives. Is it safe? For my situation I would prefer to use "setmax"
or disk specific "seagate" (see later), but I do not know how to change
the kernel idea of drive geometry and capacity. I use 2.2.19 + ide patch.
Neither fdisk nor dd would not read past the clipped capacity before or after
software unclipping.

>
> In the case of this particular disk the manufacturer says:
> Use the Set Features command (EF) with subfunction F1.
> That tells the disk to report full capacity.
> (ATA-6 says that F1 is reserved for use by the Compact Flash Association)
>
> [Could you try that and report identify output before and after?]

Yes, I tried that and it does report unclipped capacity.
seagate.c is attached for reference.

stalex@eagle:~$ sudo hdparm -I /dev/hdb
/dev/hdb:

 Model=TS438042 A , FwRev=.350 , SerialNo=H30E0186
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=?16?
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=66055248
 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
stalex@eagle:~$ sudo /usr/src/seagate /dev/hdb
Using device /dev/hdb
Sending Set Features F1 subcommand
Done.
stalex@eagle:~$ sudo hdparm -I /dev/hdb

/dev/hdb:

 Model=TS438042 A , FwRev=.350 , SerialNo=H30E0186
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=2048kB, MaxMultSect=16, MultSect=?16?
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78165360
 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 

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