When copying large files or testing writespeed with dd, the max writespeed I can get is about 12-15MB/s on drives using the NTFS filesystem. I tested multiple drives (all connected using SATA) which all got writespeeds of 100MB/s+ on Windows or when formatted with ext4, so it's not an alignment or drive issue.
top shows high cpu usage for the mount.ntfs process.
AMD dual core processor (2.2 GHz)
Kernel version: 3.5.0-23-generic
Ubuntu 12.04ntfs-3g version: both 2012.1.15AR.1 (Ubuntu default version) and 2013.1.13AR.2
How can I fix the writespeed?
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