Date: Thu, 6 Aug 1998 20:55:56 +1000 From: Bruce Evans <bde@zeta.org.au> To: ks@itp.ac.ru, mike@smith.net.au Cc: hardware@FreeBSD.ORG Subject: Re: IBM 16 GB IDE HDD Message-ID: <199808061055.UAA12694@godzilla.zeta.org.au>
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>> >> how can I use the full capacity of my IBM DTTA-351680 16GB IDE drive? >> >> "wd" driver can see only 8GB, and manual drive geometry installation >> >> in fdisk did not change it - my FreeBSD-3.0-980311 can see only 8GB. >> > >> >See the 'wd' manpage for the option to use LBA addressing for disks > 8GB. >> > >> >> There are nothing about it. > >You're obviously more out of date than I thought. From a more recent >wd.4: This is obvious from the sate of the 980311 date. > 0x1000 Use LBA addressing instead of the default CHS addressing. This is seriously incomplete and out of date. LBA addressing should almost never be used, since no cases are known where it is necessary, and cases are known where it causes trashed disks (dumping to any drive where the default geometry is not the same as the fake LBA geometry). >> BTW, I found the way via "by hand" slice/partition edition (not using LBA). This was supposed to work for drive sizes up to 2^31-1 sectors, but it only works for drives with (possibly fake) geometry up to C/H/S = 1024/255/63, i.e., it breaks at 8GB where you need it most. >Hmm. I think that you will still hit problems at the 8GB mark, but you >may have removed the only safety barrier. Maybe there wasn't really a barrier. ATA disks larger than about 8GB are supposed to have an artifical barrier at about 8GB. If you ignore this barrier and can somehow tell the driver the true size then they will just work under FreeBSD provided they support CHS addressing. Bruce To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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