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diff --git a/src/hpa_dco.h b/src/hpa_dco.h
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+/*.
+ * hpa_dco.h: The header file for the host protected area (HPA) and
+ * disk configuration overlay routines
+ *
+ * Copyright https://github.com/PartialVolume/shredos.x86_64
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free Software
+ * Foundation, version 2.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#ifndef HPA_DCO_H_
+#define HPA_DCO_H_
+
+#define HPA_DISABLED 0
+#define HPA_ENABLED 1
+#define HPA_UNKNOWN 2
+#define HPA_NOT_APPLICABLE 3
+#define HPA_NOT_SUPPORTED_BY_DRIVE 4
+
+int hpa_dco_status( nwipe_context_t* );
+
+u64 nwipe_read_dco_real_max_sectors( char* );
+
+typedef struct nwipe_sense_dco_identify_t_t_
+{
+ /* This struct contains some of the decoded fields from the sense data after a
+ * ATA 0xB1 device configuration overlay command has been issued. We mainly
+ * use it to decode the real max sectors
+ */
+ u64 dco_real_max_sectors;
+} nwipe_sense_dco_identify_t_t_;
+
+#endif /* HPA_DCO_H_ */