Missing hard drive space?
I just put in a secondary drive, a 1TB. It formatted out to only 917GB, which doesn't seem right, but okay. Its an ext3 file system.
The drive is empty, but it shows 6% used, leaving only 870GB free. Why is that? |
Hard disk vendors use 1000 for kilobyte while computers use 1024. So Your harddisk is (in computerterms) smaller than what the HD vendor claims; 1000/1024 to the power of 4 is 91% so your 917GB is more or less right.
I don't know the finer details of filesystems, but it makes sense to me that during the formatting information is already written to the disk. Is 6% much? I don't know. |
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Here is an article describing ext3 overhead in more detail. |
By default ext2/3 filesystems reserve 5% for roots use. This is to help fragmentation and allow root to login if the filesystem becomes full. If its a secondary drive and not / you can safely change reserve space to zero using tune2fs.
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If the amount being reserved is too much for you and it is not where the / (as in root) partition is, you can change the amount reserved. There have been a number of thread here about how to do this.
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-m reserved-blocks-percentage |
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