The Linux SCSI Generic (sg) HOWTO
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# 8.21. SG_GET_TRANSFORM

SG_GET_TRANSFORM 0x2205. Third argument is ignored. Only is meaningful when SG_EMULATED host has yielded 1 (i.e. the low-level is the ide-scsi device driver); otherwise an EINVAL error occurs. Returns 0 to indicate _not_ transforming SCSI to ATAPI commands (default). Returns 1 when it is transforming them.

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SG_SET_TRANSFORM | Up | Sg ioctls removed in version 3