Two types of SCSI devices are accessible via the sd driver:
"direct access" devices which are usually magnetic disks. [SCSI peripheral device code is 0]
"Optical memory devices" which are often called MOD disks. [SCSI peripheral device code is 7]
The sd driver is capable of recognizing 128 disks when it is loaded at kernel boot time or later as a module. However, once it is loaded, it will only recognize a fixed number of additional disks. The number of additional disks that can be accommodated is set by the kernel configuration parameter CONFIG_SD_EXTRA_DEVS whose default value is 40.
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Created 1996-2022 by Maxim Chirkov
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