Backup failure due to insufficient disk space

While running backup of 4 TB database on Local C drive where available space is around 1.5 TB on SQL server 2008 R2 EE backup command failed with some error.  But the error did not depict the insufficient disk space.  After modifying the command with backup compression option  completed successfully.

BACKUP DATABASE [GoogleAnalytics]

TO DISK  = 'C:\GA-DB-Backup\GoogleAnalytics_06122012.BAK'

WITH INIT,STATS = 10

Error message

Msg 3271, Level 16, State 1, Line 1

A nonrecoverable I/O error occurred on file "C:\GA-DB-Backup\GoogleAnalytics_06122012.BAK:" 112(failed to retrieve text for this error. Reason: 15105).

Msg 3013, Level 16, State 1, Line 1

BACKUP DATABASE is terminating abnormally.

So you should not panic, first need to check disk space whether is sufficient to take backup of database based on the size.