apb@lzga.ATT.COM (Amrit Bains) (08/10/90)
Hi, I just brought a CDC WREN IV Model Number 94171-307 ( 8-). The disk drive has 320 MB of disk space. But when I added it to my system it showed only 286 MB ( 8-( ). Does anyony know why this is happening!!! My Configuration: 386/25 C&T Motherboard. CDC WREN IV 320MB (shows only 286 MB)- (BOOT DISK SCSI ID 0) 80MB Seagate ST296N - (SECOND DISK SCSI ID 1) WD7000-FASST2 SCSI Host Adapter. (Western Digital) Any help would be appreciated!!!! apb@lzga.att.com or abains@attunix.att.com
herbie@bruce.cs.monash.OZ.AU (Andrew Herbert) (08/13/90)
In <2001@lzga.ATT.COM> apb@lzga.ATT.COM (Amrit Bains) writes: >I just brought a CDC WREN IV Model Number 94171-307 ( 8-). Me too ;-). >The disk drive has 320 MB of disk space. >But when I added it to my system it showed only 286 MB ( 8-( ). >Does anyony know why this is happening!!! Well... According to the OEM manual, the -307 means it comes formatted for 307MB. A table in the abovementioned indicates that if formatted with 512 byte sectors and no spare sectors on each track the drive will end up with 307MB. To get 320MB, format with 1024 byte sectors and no spares. From memory, having one spare 512 byte sector per track (or perhaps they meant cylinder?) results in a 301MB drive. Andrew p.s. Anyone know how to select what read-ahead the drive uses with its cache? Also, what is the performance difference between the -307 Wren IV and the -344? (i.e. how much difference does synchronous scsi make?) Thanks.
jbayer@ispi.COM (Jonathan Bayer) (08/13/90)
apb@lzga.ATT.COM (Amrit Bains) writes: >Hi, >I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >The disk drive has 320 MB of disk space. This is unformatted capacity!!!! >But when I added it to my system it showed only 286 MB ( 8-( ). >Does anyony know why this is happening!!! This is after being formatted!!! JB -- Jonathan Bayer Intelligent Software Products, Inc. (201) 245-5922 500 Oakwood Ave. jbayer@ispi.COM Roselle Park, NJ 07204
dolf@fwi.uva.nl (Dolf Starreveld) (08/14/90)
apb@lzga.ATT.COM (Amrit Bains) writes: >Hi, >I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >The disk drive has 320 MB of disk space. >But when I added it to my system it showed only 286 MB ( 8-( ). >Does anyony know why this is happening!!! CDC always lists its products with unformatted capacities. The product number you give indicates that it is a 307 Mb unformatted disk. On the other hand and add I have here advertises the Wren IV as 350M unformatted. I do not have my CDC documentation handy here, so I can not tell you which of the two is right. Anyway, if the unformatted capacity is 307 or 320 (the number you mention) 286M formatted is quite normal. >My Configuration: >386/25 C&T Motherboard. >CDC WREN IV 320MB (shows only 286 MB)- (BOOT DISK SCSI ID 0) >80MB Seagate ST296N - (SECOND DISK SCSI ID 1) ^^ Here is another example. 96Mb unformatted, 80Mb formatted. >WD7000-FASST2 SCSI Host Adapter. (Western Digital) --dolf -- Dolf Starreveld Phone: +31 20 592 5056/5022 (FAX: 5155), TELEX: 10262 HEF NL EMAIL: dolf@fwi.uva.nl (dolf%fwi.uva.nl@hp4nl.nluug.nl) SNAIL: Dept. of Math. and Computing Science, University of Amsterdam, Kruislaan 409, NL-1098 SJ Amsterdam, The Netherlands
heiser@tdw201.ed.ray.com (08/14/90)
In article <2857@bruce.cs.monash.OZ.AU> herbie@bruce.cs.monash.OZ.AU (Andrew Herbert) writes: >In <2001@lzga.ATT.COM> apb@lzga.ATT.COM (Amrit Bains) writes: >>I just brought a CDC WREN IV Model Number 94171-307 ( 8-). > >Me too ;-). > >>The disk drive has 320 MB of disk space. >>But when I added it to my system it showed only 286 MB ( 8-( ). >>Does anyony know why this is happening!!! > >Well... According to the OEM manual, the -307 means it comes formatted for >307MB. A table in the abovementioned indicates that if formatted with 512 byte >sectors and no spare sectors on each track the drive will end up with 307MB. >To get 320MB, format with 1024 byte sectors and no spares. From memory, having >one spare 512 byte sector per track (or perhaps they meant cylinder?) results in >a 301MB drive. How does one change this so as to use the "full capacity" of the drive? Why is it set up this way (what is the technical reason for it)? Thanks, Bill -- Bill Heiser Work: heiser@tdw201.ed.ray.com {decuac,necntc,uunet}!rayssd!tdw201!heiser Home: Bill.Heiser@f240.n322.z1.fidonet.org (Fidonet 1:322/240) The Think_Tank BBS (508)655-3848 1200/2400/9600-HST Other: 75106.2332@compuserve.com Other: heiser@world.std.com (Public Access Unix)
bote@csense.uucp (John Boteler) (08/15/90)
From article <1665@ispi.COM>, by jbayer@ispi.COM (Jonathan Bayer): > apb@lzga.ATT.COM (Amrit Bains) writes: >>I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >>The disk drive has 320 MB of disk space. > > This is unformatted capacity!!!! Oh yes. The oxymoron of the year: "unformatted capacity". Like that has any meaning whatsoever! -- John Boteler bote@csense.uucp {uunet | ka3ovk}!media!csense!bote NCN NudesLine: 703-241-BARE -- VOICE only, Touch-Tone(TM) signalling
wiess@mrsvr.UUCP (Dan Wiesenstien) (08/16/90)
From article <1195@carol.fwi.uva.nl>, by dolf@fwi.uva.nl (Dolf Starreveld): > apb@lzga.ATT.COM (Amrit Bains) writes: >>Hi, > >>I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >>The disk drive has 320 MB of disk space. > > Kruislaan 409, NL-1098 SJ Amsterdam, The Netherlands This is an older (several months) drive - the '307' on this drive is its formatted capacity using 1024 byte blocks. The new drives (which are physically identical) have the part number 94171-350. The '350' is the unformatted capacity. Seagate decided to have the part numbers reflect the unformatted capacity, so there have been a few part numbers change. Dan Wiesenstien G.E. Medical Systems | Scanners 'R' Us med.ge.com!wiess
ecr@cipric.mn.org (Edward C. Regal) (08/16/90)
In article <2001@lzga.ATT.COM> apb@lzga.ATT.COM (Amrit Bains) writes: >I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >The disk drive has 320 MB of disk space. >when I added it to my system it showed only 286 MB ( 8-( ). Sounds like the old lying drive trick to me ...(:- Actually sounds like the difference between an unformatted and a formatted drive. Ed
moncreaf@granite.cr.bull.com (Donald W. Moncreaff) (08/20/90)
In article <353@cipric.mn.org> ecr@cipric.mn.org (Edward C. Regal) writes: >In article <2001@lzga.ATT.COM> apb@lzga.ATT.COM (Amrit Bains) writes: >>I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >>The disk drive has 320 MB of disk space. >>when I added it to my system it showed only 286 MB ( 8-( ). > >Sounds like the old lying drive trick to me ...(:- > >Actually sounds like the difference between an unformatted and a >formatted drive. > >Ed what is the range of formatted capacity for the wren *-307 drives?
honeywel@hydra.unm.edu (Michael A. Thomas - Honeyw) (08/21/90)
In article <1990Aug20.115516.1454@granite.cr.bull.com> moncreaf@granite.cr.bull.com (Donald W. Moncreaff) writes: >In article <353@cipric.mn.org> ecr@cipric.mn.org (Edward C. Regal) writes: >>In article <2001@lzga.ATT.COM> apb@lzga.ATT.COM (Amrit Bains) writes: >>>I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >>>The disk drive has 320 MB of disk space. >>>when I added it to my system it showed only 286 MB ( 8-( ). >> >>Sounds like the old lying drive trick to me ...(:- >> >>Actually sounds like the difference between an unformatted and a >>formatted drive. >> >>Ed > >what is the range of formatted capacity for the wren *-307 drives? Regarding formatted capacity versus unformatted, I came across something that might be interesting in the CDC manuals: WREN IV SCSI MODEL 94171-344 Formatted capacity achieved depends on the number of spare reallocation sectors reserved and the number of bytes per sector. The following table shows some typical formatted capacities achievable. Spare sectors or cylinders Sector Size reserved for reallocation 512 Bytes/Sect.|1024 Bytes/Sect. --------------------------------------------------------------- No spares 330MB 345MB One spare sector per track 323MB 330MB Two spare cylinders/unit* 330MB 344MB *Spare cylinders are on the inner tracks.
heiser@tdw201.ed.ray.com (08/21/90)
In article <2927@mrsvr.UUCP> wiess@mrsvr.UUCP (Dan Wiesenstien) writes: >From article <1195@carol.fwi.uva.nl>, by dolf@fwi.uva.nl (Dolf Starreveld): >>>I just brought a CDC WREN IV Model Number 94171-307 ( 8-). >>>The disk drive has 320 MB of disk space. >> >This is an older (several months) drive - the '307' on this drive is its >formatted capacity using 1024 byte blocks. The new drives (which are >physically identical) have the part number 94171-350. The '350' is the >unformatted capacity. Seagate decided to have the part numbers reflect >the unformatted capacity, so there have been a few part numbers change. > Hi, I have one of the "307" models -- and would like to know how to make the *formatted capacity* 307mb. When I formatted it using the bios format routine on my Adaptec 1542b, it formatted it to 289MB. How does one change the format to format with "1024byte blocks?" (is this desirable?) I'm using the drive to run Unix (Esix), and the space is actually down to 266 mb or so after the Unix format runs. When I ran the format, the only question it asked me was what interleave to use (I used zero). Thanks for any help I can get on this. I have to do a re-install of the OS anyway, so this would be a good time to make a change (if I can / or if I should). Bill -- Bill Heiser Work: heiser@tdw201.ed.ray.com {decuac,necntc,uunet}!rayssd!tdw201!heiser Home: Bill.Heiser@f240.n322.z1.fidonet.org (Fidonet 1:322/240) The Think_Tank BBS (508)655-3848 1200/2400/9600-HST Other: 75106.2332@compuserve.com Other: heiser@world.std.com (Public Access Unix)
heiser@tdw201.ed.ray.com (08/22/90)
In article <1990Aug20.171219.26153@ariel.unm.edu> honeywel@hydra.unm.edu (Michael A. Thomas - Honeyw) writes: > WREN IV SCSI MODEL 94171-344 > > Formatted capacity achieved depends on the number of spare reallocation > sectors reserved and the number of bytes per sector. The following table > shows some typical formatted capacities achievable. > How do you control the number of bytes per sector? Is it advisable to have a large or a small number? When I formatted my 171-307, it didn't ask me anything except for the interleave. (zero). If there's some way to increase the capacity of my 307 from 285 to 307, without causing other problems, I'd sure like to do it. I'm using an Adaptec 1542b controller if that matters. Thanks, bill -- Bill Heiser Work: heiser@tdw201.ed.ray.com {decuac,necntc,uunet}!rayssd!tdw201!heiser Home: Bill.Heiser@f240.n322.z1.fidonet.org (Fidonet 1:322/240) The Think_Tank BBS (508)655-3848 1200/2400/9600-HST Other: 75106.2332@compuserve.com Other: heiser@world.std.com (Public Access Unix)
src@scuzzy.mbx.sub.org (Heiko Blume) (08/23/90)
heiser@tdw201.ed.ray.com writes: >>[using] >>one spare 512 byte sector per track (or perhaps they meant cylinder?) results >>in a 301MB drive. >How does one change this so as to use the "full capacity" of the drive? >Why is it set up this way (what is the technical reason for it)? you have to talk to the disk using a utility like 'scsicntl.exe' from roy neese (he's at adaptec and the utility only works with adaptec host adapters) to issue the proper mode select commands to the drive. you can set a lot of very interesting parameters that can affect throughput dramatically. especially read-ahead buffers and caches are *disabled* by default in many drives. i have posted a long description of many of these parameters (for disk drives) to comp.periphs.scsi some weeks ago. i also have the above mentioned software, but i'm in germany so you'd better look elsewhere first. -- Heiko Blume c/o Diakite blume@scuzzy.mbx.sub.org FAX (+49 30) 882 50 65 Kottbusser Damm 28 blume@netmbx.UUCP VOICE (+49 30) 691 88 93 D-1000 Berlin 61 blume@netmbx.de TELEX 184174 intro d scuzzy Any ACU,e 19200 6919520 ogin:--ogin: nuucp ssword: nuucp