jw@pan.UUCP (Jamie Watson) (01/14/88)
Has anyone ever tried putting 3rd party disks into an RT? Exactly what kind of disks does it take? The documentation says that the original cpu machines use ESDI disks, while the new systems use Extended ESDI disks. What is the difference between these - is it only a controller or formatting issue, so the disks are physically the same? If anyone has specific information about manufacturers or types of disks that are known to work, that would be very helpful. jw
stiber@CS.UCLA.EDU (01/15/88)
Our RTs use ordinary AT hard disk controller cards. We had added a
3rd party OEM Seagate 30M drive (originally intended for and used in
an AT) to one machine. If you are running 4.3, you can use
"diskpart", "sautil", "minidisk", etc. to get the machine to
understand what the disk is, how it is to be partitioned, etc. Of
course, this interface is slower than ESDI, but since we don't have
any ESDI hardware to play with...
"Faith is good, but skepticism is better"
- Giuseppe Verdi
Michael Stiber
Email: US Mail:
stiber@cs.ucla.edu UCLA Computer Science Dept.
...{ucbvax,ihpn4}!ucla-cs!stiber Machine Perception Laboratory
3564 Boelter Hall
Los Angeles, CA 90024
"Faith is good, but skepticism is better"
- Giuseppe Verdi
Michael Stiber
Email: US Mail:
stiber@cs.ucla.edu UCLA Computer Science Dept.
...{ucbvax,ihpn4}!ucla-cs!stiber Machine Perception Laboratory
3564 Boelter Hall
Los Angeles, CA 90024kaplan@cmcl2.NYU.EDU (Laurence S. Kaplan) (01/16/88)
In article <362@pan.UUCP> jw@pan.UUCP (Jamie Watson) writes: > >Has anyone ever tried putting 3rd party disks into an RT? Exactly what >kind of disks does it take? The documentation says that the original cpu >machines use ESDI disks, while the new systems use Extended ESDI disks. >What is the difference between these - is it only a controller or formatting >issue, so the disks are physically the same? > >If anyone has specific information about manufacturers or types of disks >that are known to work, that would be very helpful. > >jw As I have mentioned before in this news group, here at NYU we are currently using three Micropolis 1355 (150 Mbyte) disk drives on both ESDI and EESDI controllers from IBM. Under ACIS 4.3 no code modifications are necessary (though they make things a little easier). Contact Micropolis for information about distribution in your area. We also have on order a 1558 which gives about 330 Mbyte formatted. The difference between IBM ESDI and EESDI is that EESDI can use disks interleaved at 1:1 while ESDI needs 4:1. Also EESDI can support up to 15Mhz transfer rates and multiple outstanding requests (assuming multiple drives on the controller). - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Laurence S. Kaplan | NYU Ultracomputer Research Project ||| 715 Broadway Rm. 1005 ||||| New York, NY 10003 ||||| (212) 998-3345 --- //\ --- arpa: kaplan@cmcl2 ----/ \---- uucp: {ihnp4,seismo}!cmcl2!kaplan ---- ----