![]() This will ensure a background init will not impede your copying. Mind you this take awhile on a 4TB file system. You can run the sudo mkfs.ext4 -E lazy_itable_init=0,lazy_journal_init=0 /dev/sd? to force the full initialization before the command returns back to the shell. Maybe the journal_init and itable_init were colliding with the your copying. By default the mkfs.ext4 runs with the lazy_itable_init and lazy_journal_init enable. I am wondering if the lazy_init was running. However, I am very surprised the ext4 had a continuous 6MB/s. The ext4 file system might not be as desirable for external devices, because the lack of native inoperability when sharing files with a Windows or MAC OS X computer. For a 4TB file system, the lack of risk prevention features should be a consideration for using an alternate file system. It does NOT have risk prevention features like journaling and redundant copies of the file allocation table or free space map. The standard exFAT should be faster it was designed with low file system overhead for consumer electronic devices like DSLR cameras. ![]()
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