11.04: hfsplus ipod: unable to mount, "unable to find Hfs+ Superblock

After reformating my mac into Ubuntu 11.04 i386, I found that my mac-formatted ipod could be recognized in diskutil though unable to mount otherwise. Upon attempting to manually mount the ipod I am presented with the message,

       wrong fs type, bad option, bad superblock on /dev/sdb3,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so

Following a dmesg |tail, I find this to come up.

[28449.632263] sd 4:0:0:0: [sdb] Bad block number requested
[28449.632301] hfs: unable to find HFS+ superblock
[28450.016082] sd 4:0:0:0: [sdb] Bad block number requested
[28450.016119] hfs: unable to find HFS+ superblock
[29837.345142] EXT4-fs (sda2): re-mounted. Opts: commit=600
[29861.607774] EXT4-fs (sda2): re-mounted. Opts: commit=0
[30393.436073] sd 4:0:0:0: [sdb] Bad block number requested
[30393.436102] hfs: unable to find HFS+ superblock
[31216.372099] sd 4:0:0:0: [sdb] Bad block number requested
[31216.372137] hfs: unable to find HFS+ superblock

Are there any Natty users finding this same problem?

How would I go about getting my ipod mountable without reformatting?