Date: Thu, 22 Jan 1998 02:01:41 -0600 From: Tony Overfield <tony@dell.com> To: Kurt Olsen <kurto@bootp.sls.usu.edu>, hackers@FreeBSD.ORG Subject: Re: Big IDE drives (>8 GB) Message-ID: <3.0.3.32.19980122020141.006c9458@bugs.us.dell.com> In-Reply-To: <199801220509.WAA07467@bootp.sls.usu.edu>
next in thread | previous in thread | raw e-mail | index | archive | help
At 10:09 PM 1/21/98 -0700, Kurt Olsen wrote: >I recently purchased a 12 Gig Bigfoot EIDE drive. At boot up, the probes >identify the drive as an 8 Gig. > >wdc0: unit 0 (wd0): <QUANTUM Bigfoot TX12.0AT> >wd0: 8063MB (16514064 sectors), 16383 cyls, 16 heads, 63 S/T, 512 B/S IDE drives are not allowed (per ATA specs) to report more than these values using the ordinary C/H/S data in the DEVICE_IDENTIFY words 1, 3 and 6. Some large (> 8 GB) IDE drives will claim only 15 heads, 16383 cyls, 63 S/T. For high capacity IDE drives, the total capacity should be obtained from words 60 and 61. It's also best to use the IDE taskfile's LBA addressing scheme. Refer to the ATA specs, if interested. Sorry for this "drive-by" response, but I won't be able to check for replies for at least a couple of weeks. The latest ATA specs are found here: http://fission.dt.wdc.com/x3t13/ (zipped MS Word .DOC file) ftp://fission.dt.wdc.com/pub/standards/x3t13/project/d1153r17.zip (.PDF file) ftp://fission.dt.wdc.com/pub/standards/x3t13/project/d1153r17.pdf Annex B is particularly relevant. - Tony
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?3.0.3.32.19980122020141.006c9458>