Knowledge Base

High CPU load when connecting high capacity hard drive via USB   ________________________________________________________________________ Applicable Environment ________________________________________________________________________ Topic: USB hard drive, high CPU load SDP: 6.4.1 Target: All supported targets ________________________________________________________________________ Recommendation ________________________________________________________________________ This is due to the FAT being read at mount time. A general rule for FAT32 is 1MB of fat per 1GB of filesystem. There is a command line option which specifies when the FAT is read. The default for 'fat' is and has always been "fat=nonrmv", which behaves as: - "always" on non-removable devices, read FAT at mount time (you will need it during it's lifetime) - "lazy" on removable devices, read FAT at access time (since there is a chance you might never need to do it before ejected) - "nonrmv", it depends on how the device is advertised using "DEV_REMOVABLE". ________________________________________________________________________ NOTE: This entry has been validated against the SDP version listed above. Use caution when considering this advice for any other SDP version. For supported releases, please reach out to QNX Technical Support if you have any questions/concerns. ________________________________________________________________________ Related Attachments  None Found

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