markf@syma.sussex.ac.uk (Mark Foster) (08/24/89)
Help....!! I am trying to get my ST 157N to format but it wont go past cylinder 557 It is supposed to be 615 cyls 26 sec/trk and 6 heads. Can someone confirm that this is correct or maybe offer a little advice as to what I may be doing wrong. My mountlist entries are for two partitions DH0: and DH1: with DH0: starting at cyl 0 to cyl 38 and DH1: for the rest. This type of arrangement works fine for the ST 138N. p.s. The system is an A500 with KS 1.2 and an Amdrive SCSI interface. -- ---Don't take life so seriously.----------///---You won't make it out alive.--- Mark Foster, Computing Service | C= /// | markf @ syma.sussex.ac.uk University of Sussex, Falmer | \\\/// | mef @ cluster.sussex.ac.uk England. BN1 9QH +44 273 607418 | \X// | ccfa3 @ cluster.sussex.ac.uk
roadman@portia.Stanford.EDU (arthur walker) (08/25/89)
In article <1280@syma.sussex.ac.uk>, markf@syma.sussex.ac.uk (Mark Foster) writes: > I am trying to get my ST 157N to format but it wont go past cylinder 557 > It is supposed to be 615 cyls 26 sec/trk and 6 heads. > > Can someone confirm that this is correct or maybe offer a little advice As with all SCSI, we don't really know how it's blocked out inside, but seagate suggests a 6 x 26 x 608 for my 157N, which is just about perfect for its advertised 94860 blocks available. SCSI INQUIRE does say 6 x 26 x 608, but there's no guarantee. 94860 is really the important number; My syquest drive tells me that the cartridges have 1275 cylinders, but for some reason its block sparing strategy on format was changed after those numbers were fixed, and using a 2 x 34 model for surfaces and blocks, I only get 1270 cylinders out of 86700 blocks. > > My mountlist entries are for two partitions DH0: and DH1: with DH0: > starting at cyl 0 to cyl 38 and DH1: for the rest. > > This type of arrangement works fine for the ST 138N. > > p.s. The system is an A500 with KS 1.2 and an Amdrive SCSI interface. I don't know this vendor, but it sounds to me as though the DOS format is what's hanging. I think one or more sectors of the drive have gone south since the last low format, and you should re-low-format the drive. Its firmware will map the offending sector/s out. If you know someone with a mac, you can get a lot of info about bad sectors with SCSI Evaluator. You can even REASSIGN bad blocks without re-low-format on drives which support it - and I believe the seagate drives do. This can be a life-saver when blocks go bad on a full volume...unless you are really unlucky, you lose only the data on the sector and if you are clever you lose the surrounding file at worst. I say, redo the low-format. If your vendor's prep software doesn't support an atomic format, do it on a friend's machine. The low format is host-independent. art walker roadman@portia.stanford.edu
kevin@cbmvax.UUCP (Kevin Klop) (08/26/89)
In article <1280@syma.sussex.ac.uk> markf@syma.sussex.ac.uk (Mark Foster) writes: >I am trying to get my ST 157N to format but it wont go past cylinder 557 >It is supposed to be 615 cyls 26 sec/trk and 6 heads. [ Stuff deleted ] >My mountlist entries are for two partitions DH0: and DH1: with DH0: >starting at cyl 0 to cyl 38 and DH1: for the rest. > What is your actual mountlist, and which controller are you using? -- Kevin -- ---------- Kevin Klop {uunet|rutgers|amiga}!cbmvax!kevin Commodore-Amiga, Inc. The number, 111-111-1111 has been changed. The new number is: 134-253-2452-243556-678893-3567875645434-4456789432576-385972 Disclaimer: _I_ don't know what I said, much less my employer.
jms@tardis.Tymnet.COM (Joe Smith) (08/27/89)
In article <1280@syma.sussex.ac.uk> markf@syma.sussex.ac.uk (Mark Foster) writes: >I am trying to get my ST 157N to format but it wont go past cylinder 557 >It is supposed to be 615 cyls 26 sec/trk and 6 heads. >Can someone confirm that this is correct or maybe offer a little advice >as to what I may be doing wrong. The ST157N I got came with a printed copy of the test results dated 11/14/88. It said that my particular drive had only 94860 blocks. (Previously, Seagate had specified 95015 blocks for the ST157N). Since 6*26*608=94848 and 6*26*609=95004, it looks like a large hunk of the 609th cylinder is reserved for bad block replacements. I decided to make DH0 smaller than 880K so it's entire contents could be copied to a backup floppy. I chose its size to end on a block number that is a multiple of 6*26 and is a multiple of 2*11. That way I could have a virtual floppy starting on cylinder boundaries. For the remainder of the disk, I chose numbers that would leave the smallest number of unused blocks. /* OverDrive Drive definition */ /* SEAGATE ST157N with 94860 blocks = 48,456,320 bytes. */ /* RES = blocks 0- 155 = cylinder 0 for boot block and disk label. */ /* DH0 = blocks 156- 1715 = 780K OFS boot disk on cylinders 1-10. */ /* DF4 = blocks 1716- 3475 = 1760 blocks for an 880K virtual floppy. */ /* DH1 = blocks 3476-94820 = 45M FFS partition with 44 blocks per "cyl". */ DH0: Device = overdrive.device Unit = 1 /* Unit 1 = SCSI drive #0, name MUST be DH0: */ Flags = 9 ; Surfaces = 6 ; BlocksPerTrack = 26 ; Reserved = 2 LowCyl = 1 ; HighCyl = 10 /* The boot block MUST match these values */ Interleave = 0 ; Buffers = 32 ; BufMemType = 1 ; Stacksize = 4000 DosType = 0x444F5300 /* Current boot block requires an OFS partition */ Mount = 1 # /* DF4 starts at ST157N cylinder 11 = block 1716 = floppy cylinder 78 */ /* DF4 ends at block 3475 = floppy cylinder 157 = ST157N cylinder 22.28 */ DF4: Device = overdrive.device Unit = 1 /* emulate a floppy here */ Flags = 9 ; Surfaces = 2 ; BlocksPerTrack = 11 ; Reserved = 2 LowCyl = 78 ; HighCyl = 157 /* 80 cylinders */ Interleave = 0 ; Buffers = 5 ; BufMemType = 1 ; Stacksize = 4000 # /* RES+DH0+DF4 = 11 * 6 * 26 + 80 * 2 * 11 = 3476 blocks = 4 * 11 * 79. */ /* 94860 = (4 * 11 * 2155) + 40. Therefore by pretending there are 44 */ /* blocks per cylinder, all but 40 blocks can be accessed and there are */ /* no wasted blocks between DF4 and DH1. */ DH1: Device = overdrive.device Unit = 1 /* 45 megabyte FFS partition */ Flags = 9 ; Surfaces = 4 ; BlocksPerTrack = 11 ; Reserved = 2 LowCyl = 79 ; HighCyl = 2154 /* blocks 3476 thru 94819 */ Interleave = 0 ; Buffers = 32 ; BufMemType = 1 ; Stacksize = 4000 DosType = 0x444F5301 ; FileSystem = L:FastFileSystem GlobVec = -1 ; Mount = 1 # -- Joe Smith (408)922-6220 | SMTP: JMS@F74.TYMNET.COM or jms@tymix.tymnet.com McDonnell Douglas FSCO | UUCP: ...!{ames,pyramid}!oliveb!tymix!tardis!jms PO Box 49019, MS-D21 | PDP-10 support: My car's license plate is "POPJ P," San Jose, CA 95161-9019 | narrator.device: "I didn't say that, my Amiga did!"
thad@cup.portal.com (Thad P Floryan) (08/28/89)
Re: Joe Smith's comments about the ST157N ... From the Seagate ST157N Product Manual, 36045-001, Rev.C, dated March 2, 1988, page 2, the guaranteed number of 512-byte sectors for the ST157N is 94,860. Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]