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ComeOnDieYoung
Feb 4, 2008, 10:48 AM
I purchased a Seagate drive for my 3.0 mac pro, the jumper limits it to 1.5gb operations as opposed to 3gb... should/can I take it out?


bigbird
Feb 4, 2008, 10:55 AM
I purchased a Seagate drive for my 3.0 mac pro, the jumper limits it to 1.5gb operations as opposed to 3gb... should/can I take it out?

Yes, just pull the jumper out. Did the jumper to limit the drive come pre-installed? If so, that's kind of strange. I've never had internal HD's come with the limiting jumper installed.
Reach
Feb 4, 2008, 11:21 AM
All the Seagate Barracudas I've seen has had the jumper-limiter on..

I have taken them off usually, but don't know if there is a real difference to be had without RAID?
ComeOnDieYoung
Feb 4, 2008, 11:45 PM
Yes, just pull the jumper out. Did the jumper to limit the drive come pre-installed? If so, that's kind of strange. I've never had internal HD's come with the limiting jumper installed.

YES. It came pre-installed, its a Seagate like the post under yours assumed.
thxdave
Mar 7, 2008, 11:16 PM
From what i've been able to find on the web, the jumper is installed to force the drive to work with 1st generation SATA controllers on older computers. I haven't been able to find a definitive answer on the Apple FAQ's about what version of SATA controller they use, but you have to assume that it would be the latest and fastest. I got two Seagate drives in the last couple of weeks and they both had the jumper installed to force the slower data transfer speed. I pulled both of them. I haven't pulled the original WD 320 gig drive shipped with my 1/08 Mac Pro to see if it has a jumper installed. Anybody else checked theirs?
kittiyut
Mar 8, 2008, 01:17 AM
Now that all my drives are installed and working properly, is it safe to just take the jumpers off?

edit : I just took them off. No noticeable change in speed (using xbench). All 5 of mine came with jumper set to limit to 1.5!
Firefly2002
Mar 8, 2008, 10:27 AM
Well, you're not really going to notice a difference in speed, as 1.5 Gbps is more than fast enough for any single drive out there in the world... 15K RPM drives included. You'd have to have RAID with a few drives before it mattered.