I-easy drive, when plugged to the mac in i get "the disk you inserted was not readable by this computer" or on the iPhone the message is "External: open-air error. path = /" how can I clear this error

Chances are it was formatted as NTFS format by the PC which is not MAC compatible. You will need to reformat the drive in HFS format if you want it to work as a MAC disk only or in FAT32 format if you want to read it in PC and MAC machines.

sometimes you get this problem if you have changed software version what software was you using before and are these zip disks off your comp originally or from another sourse you could try reinstalling the software that came with it or if dont have software you should be able to get it off the net hope this is some help ...............................................

I had the same issue with my Mac and my Droid.
I ended up using a program called "Easy Phone Tunes" Install the app on your phone and on your computer, and when you plug in your phone you can sync up a selected playlist or three to your phone.
http://easyphonetunes.com/

First, connect the hard drive to the computer. Go to the search bar in the top right and search: Disk Utility. Then select your hard drive (not a subsection, the actual hard drive). go to the First Aid tab, and click "repair disk".

If this does not fix it, then I am afraid that your drive is dead.You may have abused the product in some way (dropped it, dropped it while it was on, bumped it, didn't drag the drive to the trash can, etc).

Hello,
if the option is available in disk utility, run First Aid.
Second option will be to run a third party partition repair utility if you have one available. If it does not fix the issue, go for a data recovery software. Some have a free trial that allows you to verify if the data on your drive is retrievable with their software before you buy the complete version to recover the data.
If the software does not do it, you can try connecting the hard drive inside the enclosure directly to the computer, but take note that:
-Taking the drive out of the enclosure will void the warranty
-If any electrical damage is present on the hard drive, it can damage your computer, so unless you are competent with electronics and can recognize healthy components, do not connect the drive to a computer.

If all those have failed, you will have to contact a data recovery center for a complete diagnostic.

Make sure that you do not format or initialize the drive.
If your data is ever available during the process, copy it to two other devices/computers to prevent the risk of losing them again.
Regards,

Try a different "data" cable between your computer and the external disk-drive.

Try connecting the unit to a different computer.
If it fails there, then the unit itself has a problem:
Either:
* the USB-to-disk-drive adapter (inside the casing) has failed;
* the disk-drive (inside the casing) has failed.

Disassemble the external unit, and remove the disk-drive. Connect it as a "slave" disk-drive in some Apple Computer, to see if the data on the disk-drive can still be accessed.

Check with LACIE, to see if their "warranty" is still valid, or if it has expired.

The Disk inserted dose not work

You will need to try formatting the drive. You can do this from the drive management section on the Mac.

The hard drive was originally formatted for a PC and I was using it with Mac products. I had to delete all the information on the hard drive so that I could reformat the external hard drive to work with my Macbook Pro. 

It could be a hard drive crash. There are places in your area that can fix these and restore your data. Check in Google and see if there is one in your area.