Seagate external hard drive is not working since I upgraded to yosemite. Can some one help me?

I can't connect my seagate external hard drive since I updated to yosemite. Im getting error code 71, can someone help me?

Try restarting with your drive plugged in. I have a very old 100GB seagate drive and it has been working fine for me so I assume yours would too.
-crazy

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How is the hard drive formatted?
Have you tried using a powered USB hub with the drive when it is connected to the Time Capsule?
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HT201250 My backup external hard drive hasn't work since I insalled Snow Leopard. Bad:( I am still learning about my MAC and would just like to re-format the hard dive and set everything up again. I want to upgrade to Lion but can't untill I backup what

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NTFS-3G could not mount /dev/disk1s1
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Hi,
See this Discussion:
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Welcome to the Apple Support Communities!
I understand that your iPhone is not being recognized by iTunes when you connect it. To help resolve this situation, please read over and work through the steps outlined in the attached article.
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External Hard Drive Will Not Work

I purchased the recommended 1TB WD hard drive. It worked for a couple of days, recorded some programs-- all of which froze after a few minutes, and now my DVR repeatedly shuts down and reboots when the external drive is plugged in. Here's the message I get:
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Prof_Ahab wrote:
I purchased the recommended 1TB WD hard drive. It worked for a couple of days, recorded some programs-- all of which froze after a few minutes, and now my DVR repeatedly shuts down and reboots when the external drive is plugged in. Here's the message I get:
the set-top box will reset because an external hard drive was improperly disconnected
The only way I have disconnected the drive is by going into settings and clicking on "EJECT" as recommended.
Would someone please tell me what is going on here? Thanks.
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Anthony_VZ
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I have a 3 year old MacBook Pro. I upgraded the system to OSX Mavericks 10.9. Since then my computer does not recognize any external hard drives. I have a 1 TB Seagate external drive and a Seagate Free Agent 750 GB hard drive and my mac does not recognize either of them. Prior to the upgrade my Mac could read and write to the drives. Below is the message I receive when I plug in the 1TB hard drive.
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jwsand wrote:
I tried to hook up the external hard drive to a different computer (imac) and it worked without any problem.
Did you cancel the backup it was attempting to do, before disconnecting it? If not, did you eject it first?
Do you mean it ran backups? Or just that it was recognized? Those are very different.
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No. I just checked and it's not there. . .
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The case's chipset(s) probably limit the size of drive/partition it can use.
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Seagate external hard drive is not working since I upgraded to yosemite. Can some one help me?

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