Q: how cam i fix 1437 error?

Hi. Take a look here: If you see error 1415, 1417, 1418, 1428, 1429, 1430, 1436, or 1439 when restoring or updating an iPod in iTunes - Apple …

Take a look at Corrupt iPod Classic. What are the HDD stats?

tt2

One pending and one reallocation isn't bad. I suspect there is some critical data in the pending sector that needs to be read at connection time which is causing the problem. Try reformatting the drive and then see if it will restore properly.

tt2

Put the device in disk mode, connect to the computer, right-click on the drive and select Format from the context menu.

tt2

Try booting up your computer with the device connected in disk mode. You may be able to format it then. Alternatively a Mac owning friend may be able to restore it for you which will reformat it at the same time, then when you restore again it will be reformatted for Windows.

tt2