SPONSORED LINKS
>Date: Thu, 20 Mar 1997 04:55:49 >From: "Bob Angell" <aimsllc@ibm.net> >Subject: Re: Help with 2.1GB on 755cd >On Wed, 19 Mar 1997 23:56:01 -0500 (EST), Joshua Hosseinof wrote: >>I bought an IBM DCRA-22160 hard drive which is the 17mm 2.1GB IDE hard >>drive that IBM sells. I've put it into a spare caddy aand plugged it in >>and I get error message 174 on my 755CD. I've tried a different hard >>drive with the same caddy and connector and it works. Is there something >>special I have to do to use the 2.1GB hard drive?? All I've had until now >>in this machine was a 540MB. I've tried with a bootable Dos disk in the >>floppy drive but I still get the Error 174 and no way to get into >>Easysetup. >I had the same problem and error number. Basically, your drive is setup as >Drive 1 vs. Drive 0, and the 174 is saying your do not have a drive in the bay >(or it cannot detect one). You will need to do surgery on the cable so that it >thinks it is Drive 0. The following advice applies only to the single drive TP systems -- dual drive capable systems like the TP760 require a different approach. IBM (and according to technical support -- the rest of the drive industry) changed the sense of the drive 0 (master) and drive 1 (slave) jumpers on transitioning from lower density drives to 2.1 GB drives. On the older drives jumpering pins 47 and 48 set drive 0 (master) and jumpering pins 49 and 50 set drive 1 (slave). On the DCRA-21260 jumpering pins 47 and 48 set drive 1 (slave) --and-- no jumper selected drive 0 (master). The old TP750/TP755 caddy jumpers pins 47 and 48. So what may be the easiest thing to do is to bend pin 48 flat against the IDC block to the right and away from the other pins -- effectively removing the pin 48/49 jumper to yield a drive select of 0 (master). This works fine in my TP750Cs. When you are ready to resell the drive just straighten up pin 48 -- and voila, the original DCRA-21260 is restored with the original DCRA-21260 select. I would not cut off pin 48 as recommended by IBM OEM technical support. You can also buy a customized caddy from people like Road Warrior which changes the drive select for you via a customized cable in their caddy. This is probably the best solution for dual disk capable boxes (TP760). Be certain to specify the caddy is for IBM's OEM DCRA-21260 hard drive. Cheers, AJ Annala, Laboratory for Molecular Pharmacology, UCL, London, UK