directedition Posted March 30, 2007 Share Posted March 30, 2007 I installed OSX and it's working nicely, but it's having trouble with IDE drives. If I have more than one IDE drive on a channel, it detects it as being 128.0GB. Why would this be? I know older motherboards weren't able to address beyond 128gb back in the olden days, but I have a very new mobo that handles large drives just fine in Linux and Windows. Could this be related to the excruciating slow drive access times I get? Maybe I need some sort of driver for the IDE controller? This is an ECS NFORCE 570 SLI-A. Link to comment https://www.insanelymac.com/forum/topic/46995-ide-drives-limited-to-128gb/ Share on other sites More sharing options...
Callysto Posted March 30, 2007 Share Posted March 30, 2007 http://forum.insanelymac.com/index.php?showtopic=44078 See Post No. 7 Link to comment https://www.insanelymac.com/forum/topic/46995-ide-drives-limited-to-128gb/#findComment-336650 Share on other sites More sharing options...
ciper Posted March 31, 2007 Share Posted March 31, 2007 Thats the magic ATA 28 bit barrier. Sounds like you need new drivers for the ide interface. On the first generation Tivo you had to replace the kernel to get over this barrier! Long story short, to get around accessing disks through straight geometry numbers they started using LBA. The original specification only allowed a max of 28 bits each of which was 512 bytes for a total of 137Gb or 128gb. Link to comment https://www.insanelymac.com/forum/topic/46995-ide-drives-limited-to-128gb/#findComment-336765 Share on other sites More sharing options...
directedition Posted April 1, 2007 Author Share Posted April 1, 2007 It appears the NFORCE 570 uses the same southbridge as its previous generation, so I used an AppleOnboardPCATA.kext file modified to work with MCP51 and it runs fine now. Full speed ahead. Link to comment https://www.insanelymac.com/forum/topic/46995-ide-drives-limited-to-128gb/#findComment-337386 Share on other sites More sharing options...
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