What is the "drive level/low space" warning threshold for Windows 7?

What is the limit for the theshold for Windows 7 to trigger a "low space" warning? (here indicated by the red bar) and is it customiseable? I think it is 10% but I am not sure and can't find any definitive result/answer.

Solution 1:

It appears that it's 10%. And apparently there is no way to change it.

Solution 2:

Free space thresholds

[The] meter under the drive icon in My Computer uses a very simple algorithm: A drive is drawn in the warning state when it is 90% full.

_{Source: How full does a hard drive have to get before Explorer will start getting concerned?}

According to my tests, the free space meter will consider the disk or partition almost full when the used space/total capacity ratio (rounded up to two decimal places) is higher or equal to 0.91.

The low disk space notification is more complex:

Windows 7 implements a timer to poll the available disk space every 10 minutes while it is running. This would be any fixed or external hard drives (USB, eSATA, 1394/FireWire). When this polling occurs, Windows 7 will pop up with a notification at the following thresholds:

• Free space less than 200 MB
• Free space less than 80 MB
• Free space less than 50 MB
• Free space equals zero

Windows 7 does not poll Zip Drives, Floppies or any other "removable" media drives.

_{Source: The low disk space notification message might be delayed up to 10 minutes in Windows 7}

All the threshold values are hard-coded, and can't be customized.