diff --git a/centipede/BUILD b/centipede/BUILD
index 77f325fe0..443704c8e 100644
--- a/centipede/BUILD
+++ b/centipede/BUILD
@@ -419,13 +419,13 @@ cc_library(
         ":binary_info",
         ":control_flow",
         ":corpus",
+        ":corpus_io",
         ":coverage",
         ":defs",
         ":feature",
         ":logging",
         ":pc_info",
         ":remote_file",
-        ":shard_reader",
         ":workdir",
         "@com_google_absl//absl/container:flat_hash_set",
         "@com_google_absl//absl/log",
@@ -750,10 +750,10 @@ cc_library(
 )
 
 cc_library(
-    name = "shard_reader",
-    srcs = ["shard_reader.cc"],
-    hdrs = ["shard_reader.h"],
-    # TODO(kcc): move shard_reader test from testing/centipede_test.cc into a dedicated test.
+    name = "corpus_io",
+    srcs = ["corpus_io.cc"],
+    hdrs = ["corpus_io.h"],
+    # TODO(kcc): move corpus_io test from testing/centipede_test.cc into a dedicated test.
     deps = [
         ":blob_file",
         ":defs",
@@ -811,6 +811,7 @@ cc_library(
         ":command",
         ":control_flow",
         ":corpus",
+        ":corpus_io",
         ":coverage",
         ":defs",
         ":early_exit",
@@ -824,7 +825,6 @@ cc_library(
         ":runner_result",
         ":rusage_profiler",
         ":rusage_stats",
-        ":shard_reader",
         ":stats",
         ":symbol_table",
         ":util",
@@ -913,6 +913,7 @@ cc_library(
     hdrs = ["distill.h"],
     deps = [
         ":blob_file",
+        ":corpus_io",
         ":defs",
         ":environment",
         ":feature",
@@ -922,7 +923,6 @@ cc_library(
         ":resource_pool",
         ":rusage_profiler",
         ":rusage_stats",
-        ":shard_reader",
         ":thread_pool",
         ":util",
         ":workdir",
@@ -1121,13 +1121,13 @@ cc_library(
     hdrs = ["seed_corpus_maker_lib.h"],
     deps = [
         ":blob_file",
+        ":corpus_io",
         ":defs",
         ":feature",
         ":logging",
         ":remote_file",
         ":rusage_profiler",
         ":seed_corpus_config_cc_proto",
-        ":shard_reader",
         ":thread_pool",
         ":util",
         ":workdir",
@@ -1349,13 +1349,13 @@ cc_test(
     srcs = ["distill_test.cc"],
     deps = [
         ":blob_file",
+        ":corpus_io",
         ":defs",
         ":distill",
         ":environment",
         ":feature",
         ":resource_pool",
         ":rusage_stats",
-        ":shard_reader",
         ":test_util",
         ":util",
         ":workdir",
@@ -1724,13 +1724,13 @@ cc_test(
         ":centipede_default_callbacks",
         ":centipede_interface",
         ":corpus",
+        ":corpus_io",
         ":defs",
         ":environment",
         ":feature",
         ":logging",
         ":mutation_input",
         ":runner_result",
-        ":shard_reader",
         ":test_util",
         ":util",
         ":workdir",
diff --git a/centipede/analyze_corpora.cc b/centipede/analyze_corpora.cc
index 8c8714260..8029f3199 100644
--- a/centipede/analyze_corpora.cc
+++ b/centipede/analyze_corpora.cc
@@ -28,13 +28,13 @@
 #include "./centipede/binary_info.h"
 #include "./centipede/control_flow.h"
 #include "./centipede/corpus.h"
+#include "./centipede/corpus_io.h"
 #include "./centipede/coverage.h"
 #include "./centipede/defs.h"
 #include "./centipede/feature.h"
 #include "./centipede/logging.h"
 #include "./centipede/pc_info.h"
 #include "./centipede/remote_file.h"
-#include "./centipede/shard_reader.h"
 #include "./centipede/workdir.h"
 
 namespace centipede {
diff --git a/centipede/centipede.cc b/centipede/centipede.cc
index ada83484e..9c1808aa4 100644
--- a/centipede/centipede.cc
+++ b/centipede/centipede.cc
@@ -79,6 +79,7 @@
 #include "./centipede/centipede_callbacks.h"
 #include "./centipede/command.h"
 #include "./centipede/control_flow.h"
+#include "./centipede/corpus_io.h"
 #include "./centipede/coverage.h"
 #include "./centipede/defs.h"
 #include "./centipede/early_exit.h"
@@ -91,7 +92,6 @@
 #include "./centipede/runner_result.h"
 #include "./centipede/rusage_profiler.h"
 #include "./centipede/rusage_stats.h"
-#include "./centipede/shard_reader.h"
 #include "./centipede/stats.h"
 #include "./centipede/util.h"
 #include "./centipede/workdir.h"
diff --git a/centipede/centipede_test.cc b/centipede/centipede_test.cc
index db528a4c6..a98ae7475 100644
--- a/centipede/centipede_test.cc
+++ b/centipede/centipede_test.cc
@@ -36,13 +36,13 @@
 #include "./centipede/centipede_default_callbacks.h"
 #include "./centipede/centipede_interface.h"
 #include "./centipede/corpus.h"
+#include "./centipede/corpus_io.h"
 #include "./centipede/defs.h"
 #include "./centipede/environment.h"
 #include "./centipede/feature.h"
 #include "./centipede/logging.h"
 #include "./centipede/mutation_input.h"
 #include "./centipede/runner_result.h"
-#include "./centipede/shard_reader.h"
 #include "./centipede/test_util.h"
 #include "./centipede/util.h"
 #include "./centipede/workdir.h"
diff --git a/centipede/shard_reader.cc b/centipede/corpus_io.cc
similarity index 99%
rename from centipede/shard_reader.cc
rename to centipede/corpus_io.cc
index d8b860e76..b526c98cb 100644
--- a/centipede/shard_reader.cc
+++ b/centipede/corpus_io.cc
@@ -11,7 +11,7 @@
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
-#include "./centipede/shard_reader.h"
+#include "./centipede/corpus_io.h"
 
 #include <functional>
 #include <memory>
diff --git a/centipede/shard_reader.h b/centipede/corpus_io.h
similarity index 100%
rename from centipede/shard_reader.h
rename to centipede/corpus_io.h
diff --git a/centipede/distill.cc b/centipede/distill.cc
index 1b4b2c0d1..99493c6a6 100644
--- a/centipede/distill.cc
+++ b/centipede/distill.cc
@@ -34,6 +34,7 @@
 #include "absl/synchronization/mutex.h"
 #include "absl/time/time.h"
 #include "./centipede/blob_file.h"
+#include "./centipede/corpus_io.h"
 #include "./centipede/defs.h"
 #include "./centipede/environment.h"
 #include "./centipede/feature.h"
@@ -43,7 +44,6 @@
 #include "./centipede/resource_pool.h"
 #include "./centipede/rusage_profiler.h"
 #include "./centipede/rusage_stats.h"
-#include "./centipede/shard_reader.h"
 #include "./centipede/thread_pool.h"
 #include "./centipede/util.h"
 #include "./centipede/workdir.h"
diff --git a/centipede/distill_test.cc b/centipede/distill_test.cc
index 4e0fd64df..454e415a5 100644
--- a/centipede/distill_test.cc
+++ b/centipede/distill_test.cc
@@ -27,12 +27,12 @@
 #include "absl/flags/reflection.h"
 #include "absl/log/check.h"
 #include "./centipede/blob_file.h"
+#include "./centipede/corpus_io.h"
 #include "./centipede/defs.h"
 #include "./centipede/environment.h"
 #include "./centipede/feature.h"
 #include "./centipede/resource_pool.h"
 #include "./centipede/rusage_stats.h"
-#include "./centipede/shard_reader.h"
 #include "./centipede/test_util.h"
 #include "./centipede/util.h"
 #include "./centipede/workdir.h"
diff --git a/centipede/seed_corpus_maker_lib.cc b/centipede/seed_corpus_maker_lib.cc
index 5e5fb6692..9eb22ef2b 100644
--- a/centipede/seed_corpus_maker_lib.cc
+++ b/centipede/seed_corpus_maker_lib.cc
@@ -44,13 +44,13 @@
 #include "absl/strings/str_replace.h"
 #include "absl/time/time.h"
 #include "./centipede/blob_file.h"
+#include "./centipede/corpus_io.h"
 #include "./centipede/defs.h"
 #include "./centipede/feature.h"
 #include "./centipede/logging.h"
 #include "./centipede/remote_file.h"
 #include "./centipede/rusage_profiler.h"
 #include "./centipede/seed_corpus_config.pb.h"
-#include "./centipede/shard_reader.h"
 #include "./centipede/thread_pool.h"
 #include "./centipede/util.h"
 #include "./centipede/workdir.h"