diff --git a/cpp/disk_image/disk_track_cache.cpp b/cpp/disk_image/disk_track_cache.cpp
index 219eb5b9..3e9ee3bc 100644
--- a/cpp/disk_image/disk_track_cache.cpp
+++ b/cpp/disk_image/disk_track_cache.cpp
@@ -278,7 +278,6 @@ bool DiskTrack::Save(const string& path)
 
 bool DiskTrack::ReadSector(vector<uint8_t>& buf, int sec) const
 {
-	assert(buf);
 	assert((sec >= 0) & (sec < 0x100));
 
 	LOGTRACE("%s reading sector: %d", __PRETTY_FUNCTION__,sec);
@@ -303,7 +302,6 @@ bool DiskTrack::ReadSector(vector<uint8_t>& buf, int sec) const
 
 bool DiskTrack::WriteSector(const vector<uint8_t>& buf, int sec)
 {
-	assert(buf);
 	assert((sec >= 0) & (sec < 0x100));
 	assert(!dt.raw);
 
diff --git a/cpp/disk_image/posix_file_handle.cpp b/cpp/disk_image/posix_file_handle.cpp
index 505b7dcb..609aa8a7 100644
--- a/cpp/disk_image/posix_file_handle.cpp
+++ b/cpp/disk_image/posix_file_handle.cpp
@@ -85,9 +85,6 @@ bool PosixFileHandle::WriteSector(const vector<uint8_t>& buf, int block)
 	}
 
 	assert(block < sec_blocks);
-	assert(memory_block);
-
-	assert((block * sec_size) <= (sb.st_size + sec_size));
 
 	size_t sector_size_bytes = (size_t)1 << sec_size;