diff --git a/devices/common/scsi/scsicdrom.cpp b/devices/common/scsi/scsicdrom.cpp
index f0dc905..8c20cd9 100644
--- a/devices/common/scsi/scsicdrom.cpp
+++ b/devices/common/scsi/scsicdrom.cpp
@@ -178,6 +178,9 @@ bool ScsiCdrom::get_more_data() {
 
 void ScsiCdrom::read(uint32_t lba, uint16_t nblocks, uint8_t cmd_len)
 {
+    if (!check_lun())
+        return;
+
     if (cmd_len == 6 && nblocks == 0)
         nblocks = 256;
 
@@ -381,6 +384,9 @@ void ScsiCdrom::read_capacity_10()
         return;
     }
 
+    if (!check_lun())
+        return;
+    
     int last_lba = (int)this->size_blocks - 1;
 
     WRITE_DWORD_BE_A(&this->data_buf[0], last_lba);
diff --git a/devices/common/scsi/scsihd.cpp b/devices/common/scsi/scsihd.cpp
index 830a1ae..9a3d06d 100644
--- a/devices/common/scsi/scsihd.cpp
+++ b/devices/common/scsi/scsihd.cpp
@@ -323,6 +323,9 @@ void ScsiHardDisk::read_capacity_10() {
         return;
     }
 
+    if (!check_lun())
+        return;
+
     uint32_t last_lba = this->total_blocks - 1;
     uint32_t blk_len  = this->sector_size;
 
@@ -346,6 +349,9 @@ void ScsiHardDisk::format() {
 }
 
 void ScsiHardDisk::read(uint32_t lba, uint16_t transfer_len, uint8_t cmd_len) {
+    if (!check_lun())
+        return;
+
     uint32_t transfer_size = transfer_len;
 
     std::memset(this->data_buf, 0, sizeof(this->data_buf));