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I formatted my 1tb external drive with the following command:

mkudffs --media-type=hd --blocksize=512 /dev/sdb

It works on linux but when i plug it in a mac (os x lion 10.7) it tells me

The disk you inserted was not readable by this computer

how can i fix this?

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tried to format to a different format, then re-format to the desired one? it gets messy sometimes changing FS types. –  Lorenzo Von Matterhorn Dec 26 '12 at 19:30
    
"Mac OS X 10.4.5 claims to support Revision 1.50 (see man mount_udf), yet it can only mount disks of the plain build properly and provides no virtualization support at all. It cannot mount UDF disks with VAT, as seen with the Sony Mavica issue.[5] Releases before 10.4.11 mount disks with Sparing Table but does not read its files correctly. Version 10.4.11 fixes this problem.[6][7]" en.wikipedia.org/wiki/Universal_Disk_Format#Compatibility I would verify which version UDF the mkudffs you ran creates by default. –  Michael Kjörling Dec 26 '12 at 20:20
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