diff --git a/init/init.c b/init/init.c
index 4667c289..30735bc2 100644
--- a/init/init.c
+++ b/init/init.c
@@ -224,7 +224,7 @@ static bool prepare_block_device(void* ctx, const char* path)
 	}
 	if ( !harddisk_inspect_blockdevice(hd) )
 	{
-		if ( errno == ENOTBLK )
+		if ( errno == ENOTBLK || errno == ENOMEDIUM )
 			return true;
 		if ( errno == EINVAL )
 			return warning("%s: %m", path), true;
diff --git a/libc/include/errno.h b/libc/include/errno.h
index 7cfd61ec..2806cb90 100644
--- a/libc/include/errno.h
+++ b/libc/include/errno.h
@@ -107,6 +107,7 @@
 #define EPROTO 97
 #define ETXTBSY 98
 #define ENOMOUNT 99
+#define ENOMEDIUM 100
 
 #define EOPNOTSUPP ENOTSUP
 #define EWOULDBLOCK EAGAIN
diff --git a/libc/string/strerror.c b/libc/string/strerror.c
index fa4729dd..39df8060 100644
--- a/libc/string/strerror.c
+++ b/libc/string/strerror.c
@@ -110,6 +110,7 @@ const char* sortix_strerror(int errnum)
 	case EPROTO: return "Protocol error";
 	case ETXTBSY: return "Text file busy";
 	case ENOMOUNT: return "No such mountpoint";
+	case ENOMEDIUM: return "No medium found";
 	default: return "Unknown error condition";
 	}
 }
diff --git a/libmount/devices.c b/libmount/devices.c
index 74ab7ecc..93fff444 100644
--- a/libmount/devices.c
+++ b/libmount/devices.c
@@ -107,7 +107,7 @@ static bool devices_iterate_open_callback(void* ctx_ptr, const char* path)
 	}
 	if ( !harddisk_inspect_blockdevice(hd) )
 	{
-		bool success = errno == ENOTBLK;
+		bool success = errno == ENOTBLK || errno == ENOMEDIUM;
 		harddisk_close(hd);
 		return success;
 	}
diff --git a/libmount/harddisk.c b/libmount/harddisk.c
index c9939117..d9435338 100644
--- a/libmount/harddisk.c
+++ b/libmount/harddisk.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2015 Jonas 'Sortie' Termansen.
+ * Copyright (c) 2015, 2021 Jonas 'Sortie' Termansen.
  *
  * Permission to use, copy, modify, and distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
@@ -97,6 +97,8 @@ bool harddisk_inspect_blockdevice(struct harddisk* hd)
 		return harddisk_close(hd), false;
 	hd->sectors = (uint16_t) strtoul(str, NULL, 10);
 	free(str);
+	if ( !hd->logical_block_size )
+		return errno = ENOMEDIUM, false;
 	// TODO: To avoid potential overflow bugs (assuming malicious filesystem),
 	//       reject ridiculous block sizes.
 	if ( 65536 < hd->logical_block_size )