Attempting to copy the disk iphone failed. an unknown error occurred (-53) (-69) (-36) (-54) (-51) (-48).
This is rare problem that occurs in Iphone. but very difficult to resolve if you don't know the reason. with this problem copy songs to iphone or ipod problem occurs. ie. you will be unable to copy songs or video to this amazing gadget. but itunes will sync calender, outlook and contacts but songs.
According to my experience. it occurs when itunes_control directory got corrupted due to some reason. This is the directory where iTunes store the songs & metadata about the songs. so if its corrupted iTunes will either copy 1-5 songs or none.
I made my phones itunes directory corrupted via deleting and recreating its some interal directory/folders. I searched the web almost a weak to get the solution but in vain. i upated my iphone os from 2.2 to 2.2.1 in try to remove the error. i though new os will again create the directory structure. But after completing the installation Itunes backup the songs with the same itunes_control structure. so all was like hell. i tought i lost my phone's song feature & should go to some expert or get my previous os back but after 15 days i got the solution and that was so easy that i laughed on me even you will.. just get a software like diskaid (www.digidna.net/diskaid/) got o itunes_control folder and rename it to some itunes_control_old.
plug out and plug in, then start the Itunes.after connecting to the itunes, you will get the following screen
Select first option "set up as new iPhone" -> continue
Itunes will recognize it as new phone. it will recreate all the directory structure and will ignore the old itunes folder.
Now try to sync it. you will automatically get smile on you face when ituens starts copying the songs.
this article is also applicable to ipod touch, or iPods
Note: Itunes will create a new folder that will not have any of the your previous songs you need to sync it to copy all the songs again to the deviceRenamed folder still on device contains the songs & it occupies space,
You have two choice,
1. Cut paste that folder to the machine/computer (Choose if any of the song is not in your itunes, but only on the device(iphone/ipod), so that later on you can search it, but thats tedious process, because itunes renames the songs while copying to the device, so you have to play songs one by one to get to the desired songs.)
2. Delete the renamed folder, if you have all songs on you machine you can delete this folder. you have to remove that folder from the device using either of above two option, to clear the space from the device.
I wrote this article to save others' 15 day. if you like share it on (digg,fb,delicious,twitter)
Thx , comments are welcome.