Zero bytes on home partition

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http://askubuntu.com – I had normally worked OS (Ubuntu 10.04 LTS). I have bought new HDD. After few days working with new HDD ((Ubuntu 12.04 LTS) I have observed new HDD has bad sectors. So I have decided to plug my old HDD back. Firstly I have plugged both HDDs and sync some data files from new HDD to old HDD. After unplugging new HDD I have booted with old HDD and here I get surprise. I can see 0 bytes available on my /home partition! I have checked with df utility - it shows /home device has 0 Available bytes. I have tried to move some files. But I still has 0 bytes on /home! Besides GParted correctly shows a (HowTos)