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CONFIG_BLK_DEV_HD_ONLY: Old hard disk (MFM/RLL/IDE) driver

General informations

The Linux kernel configuration item CONFIG_BLK_DEV_HD_ONLY:

Help text

There are two drivers for MFM/RLL/IDE hard disks. Most people use the newer enhanced driver, but this old one is still around for two reasons. Some older systems have strange timing problems and seem to work only with the old driver (which itself does not work with some newer systems). The other reason is that the old driver is smaller, since it lacks the enhanced functionality of the new one. This makes it a good choice for systems with very tight memory restrictions, or for systems with only older MFM/RLL/ESDI drives. Choosing the old driver can save 13 KB or so of kernel memory.

If you want to use this driver together with the new one you have to use "hda=noprobe hdb=noprobe" kernel parameters to prevent the new driver from probing the primary interface.

If you are unsure, then just choose the Enhanced IDE/MFM/RLL driver instead of this one. For more detailed information, read the Disk-HOWTO, available from



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