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IWETHEY Home / IWETHEY Board / Linux Forum / Filesystems, sure, but...
Post #114,101
by kmself
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8/17/03 8:30:48 PM
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New Filesystems, sure, but...

...problem is BIOSes originally topping at 512 MB disk support.

--\r\n
Karsten M. Self [link|mailto:kmself@ix.netcom.com|kmself@ix.netcom.com]\r\n
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[link|http://twiki.iwethey.org/twiki/bin/view/Main/|TWikIWETHEY] -- an experiment in collective intelligence. Stupidity. Whatever.\r\n
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Post #114,102
by pwhysall
Picture of pwhysall
8/17/03 8:32:12 PM
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New That's long since dead
That problem had largely gone away by the time the first Pentium machines arrived.

Peter
[link|http://www.debian.org|Shill For Hire]
[link|http://www.kuro5hin.org|There is no K5 Cabal]
[link|http://guildenstern.dyndns.org|Blog]
Post #114,118
by lordbeatnik
8/17/03 9:27:02 PM
Reply
New Not just bios, IDE design evils
The problem with the large disks is the evil hack they did to add lba48 (i.e. >137GB) addressing to IDE drives. If the IDE driver doesn't handle it right it corrupts everything by reading or writing the wrong sectors.

The lba48 hack is a testament to the corner cutting the IDE drive makers do. In lba48 mode, the driver writes 24 bits of the address to a set of registers. It then writes the last 24 bits to the same registers. So if the driver botches the lba48 setup or the double write for the address, your large disk just got crap scribbled who knows where. The scsi command set can be insane in its complexity, but IDE is crazy in its hack on top of a cludge design.

I'm not sure how complete the lba48 support is in the different linux kernels. I don't have such disks so I haven't kept up.

David "LordBeatnik"
     It is almost Linux time - (orion) - (33) - Aug. 17, 2003, 03:20:25 PM EDT
         Re: It is almost Linux time - (deSitter) - (2) - Aug. 17, 2003, 04:00:37 PM EDT
             Why Windows (new thread) - (orion) - Aug. 17, 2003, 05:03:17 PM EDT
             Why OS/2? (new thread) - (orion) - Aug. 17, 2003, 05:06:27 PM EDT
         Hard Drives larger than 137 Gigs and Linux - (orion) - (28) - Aug. 17, 2003, 07:14:06 PM EDT
             Re: Hard Drives larger than 137 Gigs and Linux - (kmself) - (14) - Aug. 17, 2003, 08:09:21 PM EDT
                 Thanks for the info - (orion) - (12) - Aug. 17, 2003, 08:38:25 PM EDT
                     Excuses - (kmself) - (8) - Aug. 17, 2003, 11:37:27 PM EDT
                         I've never had a problem - (imric) - Aug. 18, 2003, 08:44:58 AM EDT
                         Not worth the time Karsten. - (folkert) - (6) - Aug. 18, 2003, 09:23:17 AM EDT
                             What happened with the CDRs you sent me - (orion) - (4) - Aug. 18, 2003, 11:49:17 AM EDT
                                 No... - (folkert) - (3) - Aug. 18, 2003, 02:45:56 PM EDT
                                     There is no Spoon - (orion) - (2) - Aug. 18, 2003, 06:02:04 PM EDT
                                         Making progress -- Win98 large disk support, etc. - (kmself) - (1) - Aug. 18, 2003, 07:43:12 PM EDT
                                             Legacy MS system - (orion) - Aug. 18, 2003, 07:48:32 PM EDT
                             Web server as Jewish grandmother? -NT - (jake123) - Aug. 18, 2003, 03:33:09 PM EDT
                     Re: Thanks for the info - (deSitter) - (2) - Aug. 17, 2003, 11:51:55 PM EDT
                         But Debian rocks post-installation! -NT - (imric) - (1) - Aug. 18, 2003, 08:47:44 AM EDT
                             Hey... - (gdaustin) - Aug. 18, 2003, 12:11:19 PM EDT
                 OK, just got the Promise PDC20268 working w/ 2.4.21 - (kmself) - Aug. 17, 2003, 10:48:07 PM EDT
             Re: Hard Drives larger than 137 Gigs and Linux - (pwhysall) - (3) - Aug. 17, 2003, 08:18:43 PM EDT
                 Filesystems, sure, but... - (kmself) - (2) - Aug. 17, 2003, 08:30:48 PM EDT
                     That's long since dead - (pwhysall) - Aug. 17, 2003, 08:32:12 PM EDT
                     Not just bios, IDE design evils - (lordbeatnik) - Aug. 17, 2003, 09:27:02 PM EDT
             Re: Hard Drives larger than 137 Gigs and Linux - (Andrew Grygus) - (8) - Aug. 17, 2003, 09:00:18 PM EDT
                 Idle curiosity - (pwhysall) - (6) - Aug. 17, 2003, 09:01:25 PM EDT
                     I seem to remember they called it quits on 3.0 desktop . . - (Andrew Grygus) - (5) - Aug. 17, 2003, 09:19:48 PM EDT
                         There is a fixpack 43 now - (jake123) - (4) - Aug. 17, 2003, 09:56:32 PM EDT
                             I stop at fixpack 12 for Warp 4 . . - (Andrew Grygus) - (3) - Aug. 17, 2003, 10:11:16 PM EDT
                                 I dunno... - (jake123) - (2) - Aug. 18, 2003, 03:27:46 PM EDT
                                     Were you running . . - (Andrew Grygus) - (1) - Aug. 18, 2003, 07:27:10 PM EDT
                                         No, I'm not (new thread) - (jake123) - Aug. 19, 2003, 09:50:05 PM EDT
                 OS/2 and NewDASD drivers (new thread) - (orion) - Aug. 18, 2003, 12:32:35 AM EDT
         Ok, starting over - (orion) - Sept. 2, 2003, 06:09:21 PM EDT

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