Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!wuarchive!uwm.edu!ogicse!pdxgate!parsely!agora!billsey From: billsey@agora.uucp (Bill Seymour) Newsgroups: comp.sys.amiga.tech Subject: Re: max hd capacity Keywords: hard disk, maxtor Message-ID: <1990Oct4.012859.8522@agora.uucp> Date: 4 Oct 90 01:28:59 GMT References: <1261@romana.Tymnet.COM> <14805@cbmvax.commodore.com> <6696@sugar.hackercorp.com> Distribution: na Organization: Open Communication Forum Lines: 40 In article <6696@sugar.hackercorp.com> peter@sugar.hackercorp.com (Peter da Silva) writes: :In article <14805@cbmvax.commodore.com> steveb@cbmvax.commodore.com (Steve Beats) writes: :: It`s worth mentioning that this limit is per-partition, not a total limit. :: You could conceivably hook up 56 disks each with a capacity of 2 Gigabytes :: to each SCSI controller card in the system. : :More than that, no? You can have much larger disks, I would assume, if you :partition them. How many partitions can you have on a disk? (I would guess :that it would at least be limited by the screen resolution in the disk setup :program). Wouldn't there be some sort of limit to the largest logical block number accessed through SCSI? According to my Maxtor XT-3000S manual (The only thing I have handy right now...) a SEEK command only allows logical block numbers up to 24 bits long, and a SEEK EXTENDED only allows logical block numbers up to 32 bits long. That means in SCSI I implementations, you're limited to about 4G blocks, or 2T byte drives. Of course, with a 2T drive, you could have 1K partitions of 2G each... The problem here is that typically, a 2T drive only uses LUN 0, and doren't support higher LUNs. That means you're limited to 7K, 2G partitions. :-( Boy! It's a good thing partition BAM storage is in fast ram! :-) :: Let`s just say that the Amiga can cope with more hard disk space than :: anyone is ever going to need.....and see which year I`m proven wrong :-) : :Just wait until someone needs a single file over 2G. Hopefully, by then we'll be able to extend the file system beyond 2 gig... Maybe go to 64bit block designators? :-- :Peter da Silva. `-_-' :. -- -Bill Seymour billsey@agora ***** American People/Link Amiga Zone Hardware Specialist NES*BILL ***** Bejed, Inc. NES, Inc. Northwest Amiga Group At Home Sometimes (503) 281-8153 (503) 246-9311 (503) 656-7393 BBS (503) 640-0842