Index: uspace/srv/bd/ata_bd/ata_hw.h
===================================================================
--- uspace/srv/bd/ata_bd/ata_hw.h	(revision 88743b50b604d7ae773de9d961b292bb34a37cc7)
+++ uspace/srv/bd/ata_bd/ata_hw.h	(revision fe1776c2d3ebc8d769a1ea50f11261d4a77969b4)
@@ -241,4 +241,56 @@
 };
 
+/** ATA packet command codes. */
+enum ata_pkt_command {
+	PCMD_INQUIRY		= 0x12,
+	PCMD_READ_12		= 0xa8
+};
+
+/** ATAPI Inquiry command */
+typedef struct {
+	uint8_t opcode;		/**< Operation code (PCMD_INQUIRY) */
+	uint8_t _res0;
+	uint8_t _res1;
+	uint8_t _res2;
+	uint8_t alloc_len;	/**< Allocation length */
+	uint8_t _res3;
+	uint8_t _res4;
+	uint8_t _res5;
+	uint32_t _res6;
+} __attribute__ ((packed)) ata_pcmd_inquiry_t;
+
+/** ATAPI Read(12) command */
+typedef struct {
+	uint8_t opcode;		/**< Operation code (PCMD_READ_12) */
+	uint8_t _res0;
+	uint32_t ba;		/**< Starting block address */
+	uint32_t nblocks;	/**< Number of blocks to transfer */
+	uint8_t _res1;
+	uint8_t _res2;
+} __attribute__ ((packed)) ata_pcmd_read_12_t;
+
+/** Data returned from Inquiry command (mandatory part) */
+typedef struct {
+	uint8_t pdev_type;	/** Reserved, Peripheral device type */
+	uint8_t rmb;		/** RMB, Reserved */
+	uint8_t std_version;	/** ISO version, ECMA version, ANSI version */
+	uint8_t atapi_ver_rdf;	/** ATAPI version, Response data format */
+	uint8_t additional_len;	/** Additional length */
+	uint8_t _res0;
+	uint8_t _res1;
+	uint8_t _res2;
+	uint8_t vendor_id[8];	/** Vendor ID */
+	uint8_t product_id[8];	/** Product ID */
+	uint8_t product_rev[4];	/** Product revision level */
+} ata_inquiry_data_t;
+
+/** Extract value of ata_inquiry_data_t.pdev_type */
+#define INQUIRY_PDEV_TYPE(val) ((val) & 0x1f)
+
+/** Values for ata_inquiry_data_t.pdev_type */
+enum ata_pdev_type {
+	PDEV_TYPE_CDROM		= 0x05
+};
+
 #endif