Date: Mon, 14 Aug 1995 00:32:58 +1000 From: Bruce Evans <bde@zeta.org.au> To: gary@palmer.demon.co.uk, vince@penzance.econ.yale.edu Cc: freebsd-hardware@FreeBSD.org, john@zyqad.co.uk, msmith@atrad.adelaide.edu.au, rgrimes@gndrsh.aac.dev.com Subject: Re: Upgrade to my machine Message-ID: <199508131432.AAA29997@godzilla.zeta.org.au>
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>> I forgot who mentioned on the list that 4 GB was the limit. What >>brand is the 9GB SCSI on news.cdrom.com? >Sorry? They're lying/mistaken. It used to be a 2GB limit (not 4 - they >were unsigned ints), but that restriction vanished quite a while ago >(somewhere between 2.0 and 2.0.5). AFAIR, it's now 1TB. The limit for disk addresses used to be 4GB (not 2 - they (sic) were unsigned ints), due to localized bugs in the disk block to byte conversion macros. This was fixed quite a while ago. Now the limit is 31 bits of disk block address and 9 bits of DEV_BSIZE size for a total of 2^40 = 1TB. The limit for file sizes and mmap offsets and/or addresses is 2GB due to sign extension bugs everywhere. Bruce
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