bfc@hpislx.HP.COM (Bryan Carpenter) (04/04/89)
I have a Supermac Dataframe XP20 that has developed a worsening habit of not spinning up when the power is turned on. The drive inside is a 3.5 inch Miniscribe model 8425. I talked to Supermac tech support, and they recommended that I could use a Seagate ST-225 as a replacement, as that was one of the drives that they used in the XP20. I would prefer to replace it with a Seagate ST-125, which is a 3.5" 20 Meg drive. All of these drives, the ST-225, the ST-125, and the Miniscribe 8425 have the same number of heads, sectors, and cylinders, but they are spec'ed differently for write precompensation as follows: Miniscribe 8425: cylinder 128 Seagate ST-225: cylinder 300 Seagate ST-125: none Since the info I got from Supermac seems to indicate that either of the first two drives can be used without changing anything in the controller, can I assume that the ST-125 could be used also? I assume that the controller is currently using write precompensation of some sort. Does anyone know if the use of write precomp on a drive that doesn't call for it will foul up the integrity of the written data? Thanks in advance for any info you can give me. Bryan Carpenter bfc%hpisla@hplabs.hp.com
Fabian@cup.portal.com (Fabian Fabe Ramirez) (04/06/89)
Bryan,
SuperMac used the following drives in the early DataFrame 20 hard disk:
Seagate ST225
Microscience HH-725
So, you can either buy an out-of-warranty replacement or you can use a ST225.
Also, any possibility that you could be using a very, old power supply?
Fabian Ramirez
SuperMac Technology
fabian@cup.portal.com
sun!cup.portal.com!fabiandrc@claris.com (Dennis Cohen) (04/07/89)
In article <16731@cup.portal.com> Fabian@cup.portal.com (Fabian Fabe Ramirez) writes: >SuperMac used the following drives in the early DataFrame 20 hard disk: > > Seagate ST225 > Microscience HH-725 > >So, you can either buy an out-of-warranty replacement or you can use a ST225. > Fabian, Didn't you forget (at least) one of the early DF-20 drives? Mine is one of the very early ones and has a Lapine (sp?) mechanism. Very quiet and it starts up much more quickly than others that I've used. -- Dennis Cohen Claris Corp. ------------ Disclaimer: Any opinions expressed above are _MINE_!