Date: 26 Nov 2006 22:16:00 -0800 From: secmgr <security@jim-liesl.org> To: Richard Coleman <rcoleman@criticalmagic.com> Cc: freebsd-stable@freebsd.org Subject: Re: Large msdosfs disk will not mount on RELENG_6 Message-ID: <1164608160.3488.30.camel@emperor> In-Reply-To: <456A5A22.9070408@criticalmagic.com> References: <456A5A22.9070408@criticalmagic.com>
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On Sun, 2006-11-26 at 19:23, Richard Coleman wrote: > I just bought a large external hard drive for home backups (500g Western Digital My Book). When I > plug it in to my machine (RELENG_6 from about a week ago), the system sees the device just fine: > > Nov 26 22:03:21 neptune kernel: umass0: Western Digital External HDD, rev 2.00/1.06, addr 2 > Nov 26 22:03:21 neptune kernel: uhid1: Western Digital External HDD, rev 2.00/1.06, addr 2, iclass 8/6 > Nov 26 22:03:21 neptune kernel: da0 at umass-sim0 bus 0 target 0 lun 0 > Nov 26 22:03:21 neptune kernel: da0: <WD 5000YS External 106a> Fixed Direct Access SCSI-4 device > Nov 26 22:03:21 neptune kernel: da0: 40.000MB/s transfers > Nov 26 22:03:21 neptune kernel: da0: 476940MB (976773168 512 byte sectors: 255H 63S/T 60801C) > > > But when I try to mount the drive (mount -t msdos /dev/da0 /mnt), the system gives the following error: > > Nov 26 22:06:41 neptune kernel: mountmsdosfs(): disk too big, sorry > > I was surprised to see a file system limitation on FreeBSD that Windows does not have. I will > probably reformat the system to ufs2, but thought I would mention this error message. I'm sure > these drives will become increasingly common. Would you share how you initialized this drive, and what parameters you used? FAT32 has a 2 TB limit for the filesystem and 2 GB for a file. The error you saw is thrown when the # of sectors exceeds an unsigned 32 bit integer. BTW, the limit is based on the DOS spec, not FreeBSD. jim
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