安全地覆盖一个大磁盘的过程是一个漫长的过程；这个过程可以加快吗？

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问题

超级用户阅读器John想知道是否有任何方法可以加快他正在执行的磁盘擦除：

I’ve tried with Disk Utility.app and diskutil at the commandline to zero out a 3TB external USB hard drive, and both work at about 1%/1hr. In Disk Utility.app I am using the 1-pass mode, and with diskutil I am using 1-pass, random.

I’m on Mavericks/10.9.

约翰有什么办法加快这个过程吗？

答案

超级用户贡献者Hennes写道：

3TB is a lot of data and USB is both relative slow and has a lot of overhead.

Assuming you have USB 2 and a reasonably good performance of 30-35MB/sec. (this is about the max write speed for USB 2)

That is a long time. And speeds can differ somewhat. In your case it seems four times as slow. Decidedly not fast, but well within reasonably speeds. Especially if there are other USB devices busy on the same USB controller.

There are at least three ways to deal with this:

1. Wait a long time.
2. Use a faster bus to the disk (e.g. an eSATA enclosure. Or mount the disk internally)
3. Do not send any data to the drive to wipe it. Instead tell the drive to wipe itself. Useful for this: DBAN and secure erase.

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