Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!husc6!bloom-beacon!oberon!cit-vax!elroy!mahendo!jplgodo!wlbr!etn-rad!steve From: steve@etn-rad.UUCP (Steve Childress) Newsgroups: comp.sys.amiga Subject: Re: hard disk flaw problems Message-ID: <310@etn-rad.UUCP> Date: Fri, 27-Nov-87 20:37:42 EST Article-I.D.: etn-rad.310 Posted: Fri Nov 27 20:37:42 1987 Date-Received: Mon, 30-Nov-87 01:32:05 EST References: <1884@cadovax.UUCP> <2605@masscomp.UUCP> <1888@cadovax.UUCP> Reply-To: steve@etn-rad.UUCP (Steve Childress) Organization: Eaton Inc. IMSD, Westlake Village, CA Lines: 33 Keywords: hard disk format flaws In article <1888@cadovax.UUCP> kaz@cadovax.UUCP (Kerry Zimmerman) writes: >In article <2605@masscomp.UUCP> rad@masscomp.UUCP (Bob Doolittle) writes: >>In article <1884@cadovax.UUCP> kaz@cadovax.UUCP (Kerry Zimmerman) writes: >> >>I have heard from my local service rep that you can't tell the 2090 >>about a disk with greater than 50Mb capacity :-(. >> > > >I don't think if there is such a limit, that that is my problem. Cylindar >205 is only about 18Mb into the drive. There are a total of 754 cylindars >with 11 heads each on this drive, so I am nowhere near 50Mb when format >starts having trouble. > Don't know if this'll help, but: I wrote a device driver, from scratch (whew!) to interface a Western Digital disk controller to which there are attached (1) a Syquest cartridge winchester and (2) an Atasi 40MB drive. Now in the Western Digital (WD) controllers, there can be at most 8 heads, but the cylinder numbers can extend to 2**16 because there are two, 8-bit registers. In the systems we're discussing, someone could, perhaps, truncate the high 8 bits of the cylinder no. in the driver. As far as I know, AmigaDOS can support a disk with 2**32 bytes of storage, per partition. Using MOUNTLIST, you can establish several physical partitions on the single physical drive, thus accomodating a drive with more than 2**32 bytes. steve childress ...wlbr!etn-rad!steve 818/706-5247