fordke@ingr.com (Keith Ford x8614) (03/01/90)
What do you know about the Perstor drive controller. It discussed by Jerry Pournelle in the latest issue of Byte magazine. It will almost double the amount of space on a hard disk. Will it work with MFM, RLL, SCSI, and ESDI? What would it do to a Seagate ST277R-1 65Mb RLL drive? -- _____________________________________________________________________ Internet: fordke@ingr.com \ "and the Trees are all kept equal UUCP: ...!uunet!ingr!fordke \ by hatchet, axe, and saw." -Rush
keithe@tekgvs.LABS.TEK.COM (Keith Ericson) (03/02/90)
In article <9027@ingr.com> fordke@ingr.com (Keith Ford x8614) writes: >What do you know about the Perstor drive controller. It discussed by >Jerry Pournelle in the latest issue of Byte magazine. It will almost >double the amount of space on a hard disk. Will it work with MFM, >RLL, SCSI, and ESDI? What would it do to a Seagate ST277R-1 65Mb RLL >drive? We returned the Perstore ARLL (Advanced (?) RLL: does that answer the "RLL,SCSI,ESDI?" question?) board we had in for evaluation: it would only run at 2:1 interleave, and that's too slow. They may have sped it up - this was some time ago - but I haven't bothered to look at it again. We prefer SCSI: a 15 Mbit/sec drive will usually turn in a CORE27 timing of about 1.4 megabytes/sec transfer rate. The 15 Mbit/sec ESDI do essentially the same. (This with Adaptec controllers: 1542A for SCSI; 2322B-8 for ESDI. The only WD adapter I've tried was an EDSI that I _think_ wasn't rated for 15Mbit/sec, so the results aren't valid...) kEITHe
Scott.Grabowski@ohiont.fidonet.org (Scott Grabowski) (03/04/90)
Keith, if you decide to buy a Perstor board, I have one for sale. It is a PS180-8XT/AT (for an 8 bit XT). I am selling it because there is and incompatibility problem with it in my machine. I was using it on a 277R-1 and it formatted fine. Also, on another machine, the data transfer rate was ~275 Kb/s on a 4.7 Mhz XT. However, I don't have the money to upgrade to a new machine, so I will just sell the Perstor. It is just over 3 months old and I am asking $150. If you want to make an offer, leave me personal E-mail because I don't check this conference that often. Looking foward to hearing from you.... -Scott Grabowski -- +----------------------------------------------------------------+ | Sent via ohiont.fidonet.org, home of the OHIONet Express BBS | | Fidonet 157/512: The Cleveland UFGATE Internet Connection! | +----------------------------------------------------------------+
larry@nstar.UUCP (Larry Snyder) (03/06/90)
In article <6991@tekgvs.LABS.TEK.COM>, keithe@tekgvs.LABS.TEK.COM (Keith Ericson) writes: > > We prefer SCSI: a 15 Mbit/sec drive will usually turn in a CORE27 timing of > about 1.4 megabytes/sec transfer rate. The 15 Mbit/sec ESDI do essentially > the same. (This with Adaptec controllers: 1542A for SCSI; 2322B-8 for ESDI. > The only WD adapter I've tried was an EDSI that I _think_ wasn't rated for > 15Mbit/sec, so the results aren't valid...) Core test is a bad benchmark with SCSI drives due to the embedded buffing on the drive. The only true way to bench SCSI devices is by timing the transfer of large blocks of data. I also use a 1542A with a Miniscribe 9380S SCSI drive. The drive is rather slow - but throughput runs at 1.2 megabytes/sec under 386/ix. -- The Northern Star Public Access Unix Site, Notre Dame, Indiana USA uucp: iuvax!ndmath!nstar!larry internet: larry@nstar USR HST 219-287-9020 * PEP 219-289-3745 * Hayes V9600 219-289-0286