diff --git a/examples/spisd/bootrom/sfsd.rom b/examples/spisd/bootrom/sfsd.rom
index 87acc71..eaee0bb 100755
Binary files a/examples/spisd/bootrom/sfsd.rom and b/examples/spisd/bootrom/sfsd.rom differ
diff --git a/examples/spisd/scsidirect.c b/examples/spisd/scsidirect.c
index 3c8050f..b6e2734 100644
--- a/examples/spisd/scsidirect.c
+++ b/examples/spisd/scsidirect.c
@@ -68,7 +68,7 @@ static uint8_t handle_inquiry(struct SCSICmd *cmd, struct IOStdReq *ior)
         return TDERR_DiskChanged;
     }
     
-    if (cmd->scsi_Length < sizeof(struct SCSI_Inquiry)) {
+    if (cmd->scsi_Length < 36) {
         return IOERR_BADLENGTH;
     }
     
@@ -180,6 +180,10 @@ void process_scsi_direct(struct IOStdReq *ior)
     cmd->scsi_Status = 0;
 
     switch (cdb[0]) {
+        case SCSI_CMD_TEST_UNIT_READY:
+            cmd->scsi_Actual = 0;
+            ior->io_Error = 0;
+            break;
         case SCSI_CMD_READ_6:
         {
             struct SCSI_CDB_6 *cdb6 = (struct SCSI_CDB_6 *)cdb;
diff --git a/examples/spisd/scsidirect.h b/examples/spisd/scsidirect.h
index 206318b..dd3a879 100644
--- a/examples/spisd/scsidirect.h
+++ b/examples/spisd/scsidirect.h
@@ -1,6 +1,7 @@
 #ifndef SCSIDIRECT_H_
 #define SCSIDIRECT_H_
 
+#define SCSI_CMD_TEST_UNIT_READY  0x00
 #define SCSI_CMD_READ_6           0x08
 #define SCSI_CMD_WRITE_6          0x0A
 #define SCSI_CMD_READ_10          0x28
diff --git a/examples/spisd/sfsd.device b/examples/spisd/sfsd.device
index 8af2642..3f07699 100755
Binary files a/examples/spisd/sfsd.device and b/examples/spisd/sfsd.device differ
diff --git a/examples/spisd/spisd.device b/examples/spisd/spisd.device
index b320e3a..2dd2e4f 100755
Binary files a/examples/spisd/spisd.device and b/examples/spisd/spisd.device differ