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ATA100 cable Pin #34 (CBLID)
I recently installed a Seagate ST380013A 80GB drive. Since there was
an eighty conductor cable there already, I merely substituted the new drive for the old slave using the old cable. I then transfered the OS and other files to it and changed the cable and jumpers to make it the master, and set the old drive slave. I just noticed that the 80 wire cable that came with the new drive has the wire from pin 34 cut just after the motherboard (blue) connector. The old cable does not have this cut. I know that pin 34 is used to detect the presence of 80 wire cables. Everything ia working OK with the cable with the un-cut wire. Just wondered why Seagate would cut the wire in the cable they supplied with the drive. Anybody know? Virg Wall -- A foolish consistency is the hobgoblin of little minds,........ Ralph Waldo Emerson (Microsoft programmer's manual.) |
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ChrisJ9876 wrote:
From: V W Wall Date: 01/04/2004 8:00 PM Eastern Standard Time Message-id: I recently installed a Seagate ST380013A 80GB drive. Since there was an eighty conductor cable there already, I merely substituted the new drive for the old slave using the old cable. I then transfered the OS and other files to it and changed the cable and jumpers to make it the master, and set the old drive slave. I just noticed that the 80 wire cable that came with the new drive has the wire from pin 34 cut just after the motherboard (blue) connector. The old cable does not have this cut. I know that pin 34 is used to detect the presence of 80 wire cables. Everything ia working OK with the cable with the un-cut wire. Just wondered why Seagate would cut the wire in the cable they supplied with the drive. Anybody know? Virg Wall -- Pin 34 is grounded in the motherboard connector (that's how the BIOS detects the 80 wire cable), and the wire is cut so that the drive doesn't see a ground on that pin (don't know what effect it would have on the drive). Perhaps your old cable had the wire isolated in some other way. I have 2 cables, one has the cut you described, the other does not, but it metered out the same. I'm aware of the grounding of pin 34 on 80 wire cables. The Seagate Barracuda 7200.7 Product Manual shows pin 34 marked as (DDIAG-CLBID) and connected to both the slave and master connectors. A "cut" connector, as in the cable supplied with their own "Baracuda" ST 380013A drive would obviously prevent this. Restance measurements show connectivity between pin 34 on master to slave connectors. There is another statement (P 23): quote "The drive detects the 80-conductor cable by sensing a capacitor at the host side through the CBLID- signal. The result is reported in a Fast Rise Detected bit (bit 13 of word 93 in the Identify drive parameter block)." I wonder how it can do this if the CBLID (34) pin is connected to ground. Every recent MB I have seen checks this pin for ground on 80 wire cables. My attention was called to this when the BIOS was taking a long time to identify the drives. I changed the HD cable and noticed the "cut" in the new cable. The problem turned out to involve the ATAPI drives on the secondary controler. I left the cable with the "uncut" wire to pin 34 in place, so I can't check it for the pin 34 connection. "If it works don't fix it!" It always bothers me when I know more about something than I understand. ;-( It happens often with Windows, but I can sometimes find the answers. Virg Wall -- A foolish consistency is the hobgoblin of little minds,........ Ralph Waldo Emerson (Microsoft programmer's manual.) |
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