Date: Wed, 3 Jan 1996 22:01:41 +1100 From: Bruce Evans <bde@zeta.org.au> To: freebsd-hackers@FreeBSD.ORG, j@uriah.heep.sax.de Subject: Re: HELP!!! THIS IS AN EMERGENCY (fwd) Message-ID: <199601031101.WAA02175@godzilla.zeta.org.au>
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>BSD does not have a 500 MB limit. It can speak whatever the hardware >allows for, this is c<=65535, h<=15, s<=255. For disks that are used 0 <= c <= 65535, 0 <= h >= 15, 1 <= s <= 255 >in a BIOS environment as well, the `s' limit is 63 however. This and the `c' limit is 1023 >would still account for 65536*16*31 = 32505856 blocks, or 15872 MB. 1024 * 16 * 63 = 1032192 blocks = 504 MB (1MB = 1024K) For IDE in c/h/s mode, the limit is 65536 * 16 * 255 = 267386880 blocks = 130560 MB For ATA/2 in LBA mode, the limit is 2^28 = 268435456 blocks = 131072 MB For SCSI, the BIOS limit should be 1024*256*63, but some some BIOSes have a limit of 255 heads, so the limit is 1024 * 255 * 63 = 16450560 blocks = 8032 MB Bruce
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