New iMac not liking external hard drives

Hi All,
I have two external hard drives that I use as my back-up with Time Machine. One runs constantly and the other I use once a week.  One is a Lacie and the other is a Seagate.  I've been using them with my MacBook Pro for a long time.
This week I got a new 27" iMac.
I used one of the external drives and the Migration Assistnat to transfer everything over to my new iMac. It worked perfectly.
Today, I went to plugin one of the drives and begin my first Time Machine backup of the new iMac.  The drive appeared on my desktop as I expected and Time Machine started preparing the backup. About 10 minutes in my drive disappeared from the desktop, Disk Utility, everything. 
I tried my other external hard drive and the identical thing happened. It appeared on the desktop, Time Machine started prepping and about 10-12 minutes in the drive disappeared.
I have tried this both through plugging each into the USB port on my keyboard and directly into the back of the iMac - same results on both.
Does anyone have any thoughts as to why both drives keep disappearing on my iMac? Currently this leaves me unable to backup to Time Machine.
Thank you,

Monolith19 wrote:
Hi All,
I have two external hard drives that I use as my back-up with Time Machine. One runs constantly and the other I use once a week.  One is a Lacie and the other is a Seagate.  I've been using them with my MacBook Pro for a long time.
This week I got a new 27" iMac.
I used one of the external drives and the Migration Assistnat to transfer everything over to my new iMac. It worked perfectly.
Today, I went to plugin one of the drives and begin my first Time Machine backup of the new iMac.  The drive appeared on my desktop as I expected and Time Machine started preparing the backup. About 10 minutes in my drive disappeared from the desktop, Disk Utility, everything. 
I tried my other external hard drive and the identical thing happened. It appeared on the desktop, Time Machine started prepping and about 10-12 minutes in the drive disappeared.
I have tried this both through plugging each into the USB port on my keyboard and directly into the back of the iMac - same results on both.
Does anyone have any thoughts as to why both drives keep disappearing on my iMac? Currently this leaves me unable to backup to Time Machine.
Thank you,
Do you see the external drives in Finder's sidebar?

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