External hd backup problems

Hello Apple Maniacs !
i plugged an external hard disc case (icy box ib3218 series 3,5" HDD JBOD subsystem with 2x1,5TB) on my mac . I formatted both disks
in disk utility to JFS+ extended to use em for data storage . the 1st disk i decided to use it for my
time machine backups . The problem i m experiencing now is that every some minutes while time machine working for backup my data the external drive seems to dissapear and appear instanltly from
my system and cause a fail to the back up (now i noticed this happens even if i dont use time machine ..even on my media playbacks from the external HD.
i dont know why my ext HD's keep restarting all the time , and im afraid for my data atm stored there , Maybe i should make something different reformat on disk utility application or ...
Your help would be appreciated

George_greece wrote:
After reading the troubleshooting C1 and according to that i reformated both disks to HFS+ journaled with GUID partition table (same partition table as my internal HD uses on my macbook pro) .
So far i managed to do the 1st time back-up pretty fine .
Yay!
Now i m checking why the external hard drives occasionally goes on sleep even when im playing files fm them ( i used to had on energy saver settings the option to disable the disks when possible enabled before -factory default , i disabled that option and the xternal drives seems stable now , sounds a bit strange for me , but works.
Yes, on occasion they won't "spin up" quickly enough from sleep, and even more rarely changing that setting will help. You might also see if the maker has a firmware or driver update for your disks.

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George_greece wrote:
After reading the troubleshooting C1 and according to that i reformated both disks to HFS+ journaled with GUID partition table (same partition table as my internal HD uses on my macbook pro) .
So far i managed to do the 1st time back-up pretty fine .
Yay!
Now i m checking why the external hard drives occasionally goes on sleep even when im playing files fm them ( i used to had on energy saver settings the option to disable the disks when possible enabled before -factory default , i disabled that option and the xternal drives seems stable now , sounds a bit strange for me , but works.
Yes, on occasion they won't "spin up" quickly enough from sleep, and even more rarely changing that setting will help. You might also see if the maker has a firmware or driver update for your disks.

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Batlo wrote:
(Time machine said it needed 29 GB for full backup and the drive had 32 GB free)
That's much too small for your backups. Time Machine usually needs 2-3 times the space of the data it's backing-up (see #1 in the Frequently Asked Questions *User Tip,* also at the top of this forum).
I noticed that it had reached 2.3 GB and was not going any higher. I let it stay like that for about 5 minutes thinking that maybe it would start going again. No luck. I shut down time machine and saw a finder window with the progress bar behind it saying 2.3 GB.
That sounds like the drive is not formatted properly. See #C1 in the Start with the Time Machine - Troubleshooting *User Tip,* also at the top of this forum.
The other problems may have the same cause.
Most likely, it's set up for Windoze and not suitable for Time Machine. With only 32 GB free, you must have other data on the drive, so you probably can't erase it and reformat it for Time Machine.
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