diff --git a/Android.bp b/Android.bp
index b91e883..e9b7b13 100644
--- a/Android.bp
+++ b/Android.bp
@@ -32,7 +32,6 @@
         "-DUSE_CHROME_NETWORK_PROXY=0",
         "-DUSE_CHROME_KIOSK_APP=0",
         "-DUSE_HWID_OVERRIDE=0",
-        "-DUSE_MTD=0",
         "-D_FILE_OFFSET_BITS=64",
         "-D_POSIX_C_SOURCE=199309L",
         "-Wa,--noexecstack",
diff --git a/BUILD.gn b/BUILD.gn
index 51a4ae0..5e76bfb 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -77,7 +77,6 @@
     "USE_HWID_OVERRIDE=${use.hwid_override}",
     "USE_CHROME_KIOSK_APP=${use.chrome_kiosk_app}",
     "USE_CHROME_NETWORK_PROXY=${use.chrome_network_proxy}",
-    "USE_MTD=${use.mtd}",
     "USE_SHILL=1",
   ]
   include_dirs = [
@@ -179,11 +178,6 @@
   deps = [
     ":update_metadata-protos",
   ]
-
-  if (use.mtd) {
-    sources += [ "payload_consumer/mtd_file_descriptor.cc" ]
-    libs += [ "mtdutils" ]
-  }
 }
 
 # The main daemon static_library with all the code used to check for updates
diff --git a/common/utils.cc b/common/utils.cc
index 34d97a2..3a234cb 100644
--- a/common/utils.cc
+++ b/common/utils.cc
@@ -83,49 +83,6 @@
 // The path to the kernel's boot_id.
 const char kBootIdPath[] = "/proc/sys/kernel/random/boot_id";
 
-// Return true if |disk_name| is an MTD or a UBI device. Note that this test is
-// simply based on the name of the device.
-bool IsMtdDeviceName(const string& disk_name) {
-  return base::StartsWith(
-             disk_name, "/dev/ubi", base::CompareCase::SENSITIVE) ||
-         base::StartsWith(disk_name, "/dev/mtd", base::CompareCase::SENSITIVE);
-}
-
-// Return the device name for the corresponding partition on a NAND device.
-// WARNING: This function returns device names that are not mountable.
-string MakeNandPartitionName(int partition_num) {
-  switch (partition_num) {
-    case 2:
-    case 4:
-    case 6: {
-      return base::StringPrintf("/dev/mtd%d", partition_num);
-    }
-    default: {
-      return base::StringPrintf("/dev/ubi%d_0", partition_num);
-    }
-  }
-}
-
-// Return the device name for the corresponding partition on a NAND device that
-// may be mountable (but may not be writable).
-string MakeNandPartitionNameForMount(int partition_num) {
-  switch (partition_num) {
-    case 2:
-    case 4:
-    case 6: {
-      return base::StringPrintf("/dev/mtd%d", partition_num);
-    }
-    case 3:
-    case 5:
-    case 7: {
-      return base::StringPrintf("/dev/ubiblock%d_0", partition_num);
-    }
-    default: {
-      return base::StringPrintf("/dev/ubi%d_0", partition_num);
-    }
-  }
-}
-
 // If |path| is absolute, or explicit relative to the current working directory,
 // leaves it as is. Otherwise, uses the system's temp directory, as defined by
 // base::GetTempDir() and prepends it to |path|. On success stores the full
@@ -473,22 +430,6 @@
     return false;
   }
 
-  size_t partition_name_len = string::npos;
-  if (partition_name[last_nondigit_pos] == '_') {
-    // NAND block devices have weird naming which could be something
-    // like "/dev/ubiblock2_0". We discard "_0" in such a case.
-    size_t prev_nondigit_pos =
-        partition_name.find_last_not_of("0123456789", last_nondigit_pos - 1);
-    if (prev_nondigit_pos == string::npos ||
-        (prev_nondigit_pos + 1) == last_nondigit_pos) {
-      LOG(ERROR) << "Unable to parse partition device name: " << partition_name;
-      return false;
-    }
-
-    partition_name_len = last_nondigit_pos - prev_nondigit_pos;
-    last_nondigit_pos = prev_nondigit_pos;
-  }
-
   if (out_disk_name) {
     // Special case for MMC devices which have the following naming scheme:
     // mmcblk0p2
@@ -501,8 +442,7 @@
   }
 
   if (out_partition_num) {
-    string partition_str =
-        partition_name.substr(last_nondigit_pos + 1, partition_name_len);
+    string partition_str = partition_name.substr(last_nondigit_pos + 1);
     *out_partition_num = atoi(partition_str.c_str());
   }
   return true;
@@ -519,13 +459,6 @@
     return string();
   }
 
-  if (IsMtdDeviceName(disk_name)) {
-    // Special case for UBI block devices.
-    //   1. ubiblock is not writable, we need to use plain "ubi".
-    //   2. There is a "_0" suffix.
-    return MakeNandPartitionName(partition_num);
-  }
-
   string partition_name = disk_name;
   if (isdigit(partition_name.back())) {
     // Special case for devices with names ending with a digit.
@@ -539,17 +472,6 @@
   return partition_name;
 }
 
-string MakePartitionNameForMount(const string& part_name) {
-  if (IsMtdDeviceName(part_name)) {
-    int partition_num;
-    if (!SplitPartitionName(part_name, nullptr, &partition_num)) {
-      return "";
-    }
-    return MakeNandPartitionNameForMount(partition_num);
-  }
-  return part_name;
-}
-
 string ErrnoNumberAsString(int err) {
   char buf[100];
   buf[0] = '\0';
@@ -566,33 +488,6 @@
   return lstat(path, &stbuf) == 0 && S_ISLNK(stbuf.st_mode) != 0;
 }
 
-bool TryAttachingUbiVolume(int volume_num, int timeout) {
-  const string volume_path = base::StringPrintf("/dev/ubi%d_0", volume_num);
-  if (FileExists(volume_path.c_str())) {
-    return true;
-  }
-
-  int exit_code;
-  vector<string> cmd = {"ubiattach",
-                        "-m",
-                        base::StringPrintf("%d", volume_num),
-                        "-d",
-                        base::StringPrintf("%d", volume_num)};
-  TEST_AND_RETURN_FALSE(Subprocess::SynchronousExec(cmd, &exit_code, nullptr));
-  TEST_AND_RETURN_FALSE(exit_code == 0);
-
-  cmd = {"ubiblock", "--create", volume_path};
-  TEST_AND_RETURN_FALSE(Subprocess::SynchronousExec(cmd, &exit_code, nullptr));
-  TEST_AND_RETURN_FALSE(exit_code == 0);
-
-  while (timeout > 0 && !FileExists(volume_path.c_str())) {
-    sleep(1);
-    timeout--;
-  }
-
-  return FileExists(volume_path.c_str());
-}
-
 bool MakeTempFile(const string& base_filename_template,
                   string* filename,
                   int* fd) {
diff --git a/common/utils.h b/common/utils.h
index 9160d9f..d949a3e 100644
--- a/common/utils.h
+++ b/common/utils.h
@@ -127,11 +127,6 @@
 // Returns true if |path| exists and is a symbolic link.
 bool IsSymlink(const char* path);
 
-// Try attaching UBI |volume_num|. If there is any error executing required
-// commands to attach the volume, this function returns false. This function
-// only returns true if "/dev/ubi%d_0" becomes available in |timeout| seconds.
-bool TryAttachingUbiVolume(int volume_num, int timeout);
-
 // If |base_filename_template| is neither absolute (starts with "/") nor
 // explicitly relative to the current working directory (starts with "./" or
 // "../"), then it is prepended the system's temporary directory. On success,
@@ -162,14 +157,6 @@
 // Returns empty string when invalid parameters are passed in
 std::string MakePartitionName(const std::string& disk_name, int partition_num);
 
-// Similar to "MakePartitionName" but returns a name that is suitable for
-// mounting. On NAND system we can write to "/dev/ubiX_0", which is what
-// MakePartitionName returns, but we cannot mount that device. To mount, we
-// have to use "/dev/ubiblockX_0" for rootfs. Stateful and OEM partitions are
-// mountable with "/dev/ubiX_0". The input is a partition device such as
-// /dev/sda3. Return empty string on error.
-std::string MakePartitionNameForMount(const std::string& part_name);
-
 // Set the read-only attribute on the block device |device| to the value passed
 // in |read_only|. Return whether the operation succeeded.
 bool SetBlockDeviceReadOnly(const std::string& device, bool read_only);
diff --git a/common/utils_unittest.cc b/common/utils_unittest.cc
index 7d1c59e..f9eb596 100644
--- a/common/utils_unittest.cc
+++ b/common/utils_unittest.cc
@@ -123,10 +123,6 @@
   EXPECT_EQ("/dev/mmcblk0", disk);
   EXPECT_EQ(3, part_num);
 
-  EXPECT_TRUE(utils::SplitPartitionName("/dev/ubiblock3_2", &disk, &part_num));
-  EXPECT_EQ("/dev/ubiblock", disk);
-  EXPECT_EQ(3, part_num);
-
   EXPECT_TRUE(utils::SplitPartitionName("/dev/loop10", &disk, &part_num));
   EXPECT_EQ("/dev/loop", disk);
   EXPECT_EQ(10, part_num);
@@ -135,14 +131,6 @@
   EXPECT_EQ("/dev/loop28", disk);
   EXPECT_EQ(11, part_num);
 
-  EXPECT_TRUE(utils::SplitPartitionName("/dev/loop10_0", &disk, &part_num));
-  EXPECT_EQ("/dev/loop", disk);
-  EXPECT_EQ(10, part_num);
-
-  EXPECT_TRUE(utils::SplitPartitionName("/dev/loop28p11_0", &disk, &part_num));
-  EXPECT_EQ("/dev/loop28", disk);
-  EXPECT_EQ(11, part_num);
-
   EXPECT_FALSE(utils::SplitPartitionName("/dev/mmcblk0p", &disk, &part_num));
   EXPECT_FALSE(utils::SplitPartitionName("/dev/sda", &disk, &part_num));
   EXPECT_FALSE(utils::SplitPartitionName("/dev/foo/bar", &disk, &part_num));
@@ -157,29 +145,6 @@
   EXPECT_EQ("/dev/mmcblk0p2", utils::MakePartitionName("/dev/mmcblk0", 2));
   EXPECT_EQ("/dev/loop8", utils::MakePartitionName("/dev/loop", 8));
   EXPECT_EQ("/dev/loop12p2", utils::MakePartitionName("/dev/loop12", 2));
-  EXPECT_EQ("/dev/ubi5_0", utils::MakePartitionName("/dev/ubiblock", 5));
-  EXPECT_EQ("/dev/mtd4", utils::MakePartitionName("/dev/ubiblock", 4));
-  EXPECT_EQ("/dev/ubi3_0", utils::MakePartitionName("/dev/ubiblock", 3));
-  EXPECT_EQ("/dev/mtd2", utils::MakePartitionName("/dev/ubiblock", 2));
-  EXPECT_EQ("/dev/ubi1_0", utils::MakePartitionName("/dev/ubiblock", 1));
-}
-
-TEST(UtilsTest, MakePartitionNameForMountTest) {
-  EXPECT_EQ("/dev/sda4", utils::MakePartitionNameForMount("/dev/sda4"));
-  EXPECT_EQ("/dev/sda123", utils::MakePartitionNameForMount("/dev/sda123"));
-  EXPECT_EQ("/dev/mmcblk2", utils::MakePartitionNameForMount("/dev/mmcblk2"));
-  EXPECT_EQ("/dev/mmcblk0p2",
-            utils::MakePartitionNameForMount("/dev/mmcblk0p2"));
-  EXPECT_EQ("/dev/loop0", utils::MakePartitionNameForMount("/dev/loop0"));
-  EXPECT_EQ("/dev/loop8", utils::MakePartitionNameForMount("/dev/loop8"));
-  EXPECT_EQ("/dev/loop12p2", utils::MakePartitionNameForMount("/dev/loop12p2"));
-  EXPECT_EQ("/dev/ubiblock5_0",
-            utils::MakePartitionNameForMount("/dev/ubiblock5_0"));
-  EXPECT_EQ("/dev/mtd4", utils::MakePartitionNameForMount("/dev/ubi4_0"));
-  EXPECT_EQ("/dev/ubiblock3_0",
-            utils::MakePartitionNameForMount("/dev/ubiblock3"));
-  EXPECT_EQ("/dev/mtd2", utils::MakePartitionNameForMount("/dev/ubi2"));
-  EXPECT_EQ("/dev/ubi1_0", utils::MakePartitionNameForMount("/dev/ubiblock1"));
 }
 
 TEST(UtilsTest, FuzzIntTest) {
diff --git a/payload_consumer/delta_performer.cc b/payload_consumer/delta_performer.cc
index f405bd9..53acc11 100644
--- a/payload_consumer/delta_performer.cc
+++ b/payload_consumer/delta_performer.cc
@@ -54,9 +54,6 @@
 #endif  // USE_FEC
 #include "update_engine/payload_consumer/file_descriptor_utils.h"
 #include "update_engine/payload_consumer/mount_history.h"
-#if USE_MTD
-#include "update_engine/payload_consumer/mtd_file_descriptor.h"
-#endif  // USE_MTD
 #include "update_engine/payload_consumer/payload_constants.h"
 #include "update_engine/payload_consumer/payload_verifier.h"
 #include "update_engine/payload_consumer/xz_extent_writer.h"
@@ -76,40 +73,9 @@
 namespace {
 const int kUpdateStateOperationInvalid = -1;
 const int kMaxResumedUpdateFailures = 10;
-#if USE_MTD
-const int kUbiVolumeAttachTimeout = 5 * 60;
-#endif
 
 const uint64_t kCacheSize = 1024 * 1024;  // 1MB
 
-FileDescriptorPtr CreateFileDescriptor(const char* path) {
-  FileDescriptorPtr ret;
-#if USE_MTD
-  if (strstr(path, "/dev/ubi") == path) {
-    if (!UbiFileDescriptor::IsUbi(path)) {
-      // The volume might not have been attached at boot time.
-      int volume_no;
-      if (utils::SplitPartitionName(path, nullptr, &volume_no)) {
-        utils::TryAttachingUbiVolume(volume_no, kUbiVolumeAttachTimeout);
-      }
-    }
-    if (UbiFileDescriptor::IsUbi(path)) {
-      LOG(INFO) << path << " is a UBI device.";
-      ret.reset(new UbiFileDescriptor);
-    }
-  } else if (MtdFileDescriptor::IsMtd(path)) {
-    LOG(INFO) << path << " is an MTD device.";
-    ret.reset(new MtdFileDescriptor);
-  } else {
-    LOG(INFO) << path << " is not an MTD nor a UBI device.";
-#endif
-    ret.reset(new EintrSafeFileDescriptor);
-#if USE_MTD
-  }
-#endif
-  return ret;
-}
-
 // Opens path for read/write. On success returns an open FileDescriptor
 // and sets *err to 0. On failure, sets *err to errno and returns nullptr.
 FileDescriptorPtr OpenFile(const char* path,
@@ -121,18 +87,11 @@
   bool read_only = (mode & O_ACCMODE) == O_RDONLY;
   utils::SetBlockDeviceReadOnly(path, read_only);
 
-  FileDescriptorPtr fd = CreateFileDescriptor(path);
+  FileDescriptorPtr fd(new EintrSafeFileDescriptor());
   if (cache_writes && !read_only) {
     fd = FileDescriptorPtr(new CachedFileDescriptor(fd, kCacheSize));
     LOG(INFO) << "Caching writes.";
   }
-#if USE_MTD
-  // On NAND devices, we can either read, or write, but not both. So here we
-  // use O_WRONLY.
-  if (UbiFileDescriptor::IsUbi(path) || MtdFileDescriptor::IsMtd(path)) {
-    mode = O_WRONLY;
-  }
-#endif
   if (!fd->Open(path, mode, 000)) {
     *err = errno;
     PLOG(ERROR) << "Unable to open file " << path;
diff --git a/payload_consumer/mtd_file_descriptor.cc b/payload_consumer/mtd_file_descriptor.cc
deleted file mode 100644
index 5d940cb..0000000
--- a/payload_consumer/mtd_file_descriptor.cc
+++ /dev/null
@@ -1,263 +0,0 @@
-//
-// Copyright (C) 2014 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// 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 "update_engine/payload_consumer/mtd_file_descriptor.h"
-
-#include <fcntl.h>
-#include <mtd/ubi-user.h>
-#include <sys/ioctl.h>
-#include <sys/stat.h>
-#include <sys/types.h>
-
-#include <memory>
-#include <string>
-
-#include <base/files/file_path.h>
-#include <base/strings/string_number_conversions.h>
-#include <base/strings/string_util.h>
-#include <base/strings/stringprintf.h>
-
-#include "update_engine/common/subprocess.h"
-#include "update_engine/common/utils.h"
-
-using std::string;
-
-namespace {
-
-static const char kSysfsClassUbi[] = "/sys/class/ubi/";
-static const char kUsableEbSize[] = "/usable_eb_size";
-static const char kReservedEbs[] = "/reserved_ebs";
-
-using chromeos_update_engine::UbiVolumeInfo;
-using chromeos_update_engine::utils::ReadFile;
-
-// Return a UbiVolumeInfo pointer if |path| is a UBI volume. Otherwise, return
-// a null unique pointer.
-std::unique_ptr<UbiVolumeInfo> GetUbiVolumeInfo(const string& path) {
-  base::FilePath device_node(path);
-  base::FilePath ubi_name(device_node.BaseName());
-
-  string sysfs_node(kSysfsClassUbi);
-  sysfs_node.append(ubi_name.MaybeAsASCII());
-
-  std::unique_ptr<UbiVolumeInfo> ret;
-
-  // Obtain volume info from sysfs.
-  string s_reserved_ebs;
-  if (!ReadFile(sysfs_node + kReservedEbs, &s_reserved_ebs)) {
-    LOG(ERROR) << "Cannot read " << sysfs_node + kReservedEbs;
-    return ret;
-  }
-  string s_eb_size;
-  if (!ReadFile(sysfs_node + kUsableEbSize, &s_eb_size)) {
-    LOG(ERROR) << "Cannot read " << sysfs_node + kUsableEbSize;
-    return ret;
-  }
-
-  base::TrimWhitespaceASCII(
-      s_reserved_ebs, base::TRIM_TRAILING, &s_reserved_ebs);
-  base::TrimWhitespaceASCII(s_eb_size, base::TRIM_TRAILING, &s_eb_size);
-
-  uint64_t reserved_ebs, eb_size;
-  if (!base::StringToUint64(s_reserved_ebs, &reserved_ebs)) {
-    LOG(ERROR) << "Cannot parse reserved_ebs: " << s_reserved_ebs;
-    return ret;
-  }
-  if (!base::StringToUint64(s_eb_size, &eb_size)) {
-    LOG(ERROR) << "Cannot parse usable_eb_size: " << s_eb_size;
-    return ret;
-  }
-
-  ret.reset(new UbiVolumeInfo);
-  ret->reserved_ebs = reserved_ebs;
-  ret->eraseblock_size = eb_size;
-  return ret;
-}
-
-}  // namespace
-
-namespace chromeos_update_engine {
-
-MtdFileDescriptor::MtdFileDescriptor()
-    : read_ctx_(nullptr, &mtd_read_close),
-      write_ctx_(nullptr, &mtd_write_close) {}
-
-bool MtdFileDescriptor::IsMtd(const char* path) {
-  uint64_t size;
-  return mtd_node_info(path, &size, nullptr, nullptr) == 0;
-}
-
-bool MtdFileDescriptor::Open(const char* path, int flags, mode_t mode) {
-  // This File Descriptor does not support read and write.
-  TEST_AND_RETURN_FALSE((flags & O_ACCMODE) != O_RDWR);
-  // But we need to open the underlying file descriptor in O_RDWR mode because
-  // during write, we need to read back to verify the write actually sticks or
-  // we have to skip the block. That job is done by mtdutils library.
-  if ((flags & O_ACCMODE) == O_WRONLY) {
-    flags &= ~O_ACCMODE;
-    flags |= O_RDWR;
-  }
-  TEST_AND_RETURN_FALSE(
-      EintrSafeFileDescriptor::Open(path, flags | O_CLOEXEC, mode));
-
-  if ((flags & O_ACCMODE) == O_RDWR) {
-    write_ctx_.reset(mtd_write_descriptor(fd_, path));
-    nr_written_ = 0;
-  } else {
-    read_ctx_.reset(mtd_read_descriptor(fd_, path));
-  }
-
-  if (!read_ctx_ && !write_ctx_) {
-    Close();
-    return false;
-  }
-
-  return true;
-}
-
-bool MtdFileDescriptor::Open(const char* path, int flags) {
-  mode_t cur = umask(022);
-  umask(cur);
-  return Open(path, flags, 0777 & ~cur);
-}
-
-ssize_t MtdFileDescriptor::Read(void* buf, size_t count) {
-  CHECK(read_ctx_);
-  return mtd_read_data(read_ctx_.get(), static_cast<char*>(buf), count);
-}
-
-ssize_t MtdFileDescriptor::Write(const void* buf, size_t count) {
-  CHECK(write_ctx_);
-  ssize_t result =
-      mtd_write_data(write_ctx_.get(), static_cast<const char*>(buf), count);
-  if (result > 0) {
-    nr_written_ += result;
-  }
-  return result;
-}
-
-off64_t MtdFileDescriptor::Seek(off64_t offset, int whence) {
-  if (write_ctx_) {
-    // Ignore seek in write mode.
-    return nr_written_;
-  }
-  return EintrSafeFileDescriptor::Seek(offset, whence);
-}
-
-bool MtdFileDescriptor::Close() {
-  read_ctx_.reset();
-  write_ctx_.reset();
-  return EintrSafeFileDescriptor::Close();
-}
-
-bool UbiFileDescriptor::IsUbi(const char* path) {
-  base::FilePath device_node(path);
-  base::FilePath ubi_name(device_node.BaseName());
-  TEST_AND_RETURN_FALSE(base::StartsWith(
-      ubi_name.MaybeAsASCII(), "ubi", base::CompareCase::SENSITIVE));
-
-  return static_cast<bool>(GetUbiVolumeInfo(path));
-}
-
-bool UbiFileDescriptor::Open(const char* path, int flags, mode_t mode) {
-  std::unique_ptr<UbiVolumeInfo> info = GetUbiVolumeInfo(path);
-  if (!info) {
-    return false;
-  }
-
-  // This File Descriptor does not support read and write.
-  TEST_AND_RETURN_FALSE((flags & O_ACCMODE) != O_RDWR);
-  TEST_AND_RETURN_FALSE(
-      EintrSafeFileDescriptor::Open(path, flags | O_CLOEXEC, mode));
-
-  usable_eb_blocks_ = info->reserved_ebs;
-  eraseblock_size_ = info->eraseblock_size;
-  volume_size_ = usable_eb_blocks_ * eraseblock_size_;
-
-  if ((flags & O_ACCMODE) == O_WRONLY) {
-    // It's best to use volume update ioctl so that UBI layer will mark the
-    // volume as being updated, and only clear that mark if the update is
-    // successful. We will need to pad to the whole volume size at close.
-    uint64_t vsize = volume_size_;
-    if (ioctl(fd_, UBI_IOCVOLUP, &vsize) != 0) {
-      PLOG(ERROR) << "Cannot issue volume update ioctl";
-      EintrSafeFileDescriptor::Close();
-      return false;
-    }
-    mode_ = kWriteOnly;
-    nr_written_ = 0;
-  } else {
-    mode_ = kReadOnly;
-  }
-
-  return true;
-}
-
-bool UbiFileDescriptor::Open(const char* path, int flags) {
-  mode_t cur = umask(022);
-  umask(cur);
-  return Open(path, flags, 0777 & ~cur);
-}
-
-ssize_t UbiFileDescriptor::Read(void* buf, size_t count) {
-  CHECK(mode_ == kReadOnly);
-  return EintrSafeFileDescriptor::Read(buf, count);
-}
-
-ssize_t UbiFileDescriptor::Write(const void* buf, size_t count) {
-  CHECK(mode_ == kWriteOnly);
-  ssize_t nr_chunk = EintrSafeFileDescriptor::Write(buf, count);
-  if (nr_chunk >= 0) {
-    nr_written_ += nr_chunk;
-  }
-  return nr_chunk;
-}
-
-off64_t UbiFileDescriptor::Seek(off64_t offset, int whence) {
-  if (mode_ == kWriteOnly) {
-    // Ignore seek in write mode.
-    return nr_written_;
-  }
-  return EintrSafeFileDescriptor::Seek(offset, whence);
-}
-
-bool UbiFileDescriptor::Close() {
-  bool pad_ok = true;
-  if (IsOpen() && mode_ == kWriteOnly) {
-    char buf[1024];
-    memset(buf, 0xFF, sizeof(buf));
-    while (nr_written_ < volume_size_) {
-      // We have written less than the whole volume. In order for us to clear
-      // the update marker, we need to fill the rest. It is recommended to fill
-      // UBI writes with 0xFF.
-      uint64_t to_write = volume_size_ - nr_written_;
-      if (to_write > sizeof(buf)) {
-        to_write = sizeof(buf);
-      }
-      ssize_t nr_chunk = EintrSafeFileDescriptor::Write(buf, to_write);
-      if (nr_chunk < 0) {
-        LOG(ERROR) << "Cannot 0xFF-pad before closing.";
-        // There is an error, but we can't really do any meaningful thing here.
-        pad_ok = false;
-        break;
-      }
-      nr_written_ += nr_chunk;
-    }
-  }
-  return EintrSafeFileDescriptor::Close() && pad_ok;
-}
-
-}  // namespace chromeos_update_engine
diff --git a/payload_consumer/mtd_file_descriptor.h b/payload_consumer/mtd_file_descriptor.h
deleted file mode 100644
index c0170b7..0000000
--- a/payload_consumer/mtd_file_descriptor.h
+++ /dev/null
@@ -1,103 +0,0 @@
-//
-// Copyright (C) 2014 The Android Open Source Project
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//      http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// 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.
-//
-
-#ifndef UPDATE_ENGINE_PAYLOAD_CONSUMER_MTD_FILE_DESCRIPTOR_H_
-#define UPDATE_ENGINE_PAYLOAD_CONSUMER_MTD_FILE_DESCRIPTOR_H_
-
-// This module defines file descriptors that deal with NAND media. We are
-// concerned with raw NAND access (as MTD device), and through UBI layer.
-
-#include <memory>
-
-#include <mtdutils.h>
-
-#include "update_engine/payload_consumer/file_descriptor.h"
-
-namespace chromeos_update_engine {
-
-// A class defining the file descriptor API for raw MTD device. This file
-// descriptor supports either random read, or sequential write but not both at
-// once.
-class MtdFileDescriptor : public EintrSafeFileDescriptor {
- public:
-  MtdFileDescriptor();
-
-  static bool IsMtd(const char* path);
-
-  bool Open(const char* path, int flags, mode_t mode) override;
-  bool Open(const char* path, int flags) override;
-  ssize_t Read(void* buf, size_t count) override;
-  ssize_t Write(const void* buf, size_t count) override;
-  off64_t Seek(off64_t offset, int whence) override;
-  uint64_t BlockDevSize() override { return 0; }
-  bool BlkIoctl(int request,
-                uint64_t start,
-                uint64_t length,
-                int* result) override {
-    return false;
-  }
-  bool Close() override;
-
- private:
-  std::unique_ptr<MtdReadContext, decltype(&mtd_read_close)> read_ctx_;
-  std::unique_ptr<MtdWriteContext, decltype(&mtd_write_close)> write_ctx_;
-  uint64_t nr_written_;
-};
-
-struct UbiVolumeInfo {
-  // Number of eraseblocks.
-  uint64_t reserved_ebs;
-  // Size of each eraseblock.
-  uint64_t eraseblock_size;
-};
-
-// A file descriptor to update a UBI volume, similar to MtdFileDescriptor.
-// Once the file descriptor is opened for write, the volume is marked as being
-// updated. The volume will not be usable until an update is completed. See
-// UBI_IOCVOLUP ioctl operation.
-class UbiFileDescriptor : public EintrSafeFileDescriptor {
- public:
-  // Perform some queries about |path| to see if it is a UBI volume.
-  static bool IsUbi(const char* path);
-
-  bool Open(const char* path, int flags, mode_t mode) override;
-  bool Open(const char* path, int flags) override;
-  ssize_t Read(void* buf, size_t count) override;
-  ssize_t Write(const void* buf, size_t count) override;
-  off64_t Seek(off64_t offset, int whence) override;
-  uint64_t BlockDevSize() override { return 0; }
-  bool BlkIoctl(int request,
-                uint64_t start,
-                uint64_t length,
-                int* result) override {
-    return false;
-  }
-  bool Close() override;
-
- private:
-  enum Mode { kReadOnly, kWriteOnly };
-
-  uint64_t usable_eb_blocks_;
-  uint64_t eraseblock_size_;
-  uint64_t volume_size_;
-  uint64_t nr_written_;
-
-  Mode mode_;
-};
-
-}  // namespace chromeos_update_engine
-
-#endif  // UPDATE_ENGINE_PAYLOAD_CONSUMER_MTD_FILE_DESCRIPTOR_H_
diff --git a/payload_consumer/postinstall_runner_action.cc b/payload_consumer/postinstall_runner_action.cc
index cc3843d..894ac7d 100644
--- a/payload_consumer/postinstall_runner_action.cc
+++ b/payload_consumer/postinstall_runner_action.cc
@@ -111,8 +111,7 @@
   const InstallPlan::Partition& partition =
       install_plan_.partitions[current_partition_];
 
-  const string mountable_device =
-      utils::MakePartitionNameForMount(partition.target_path);
+  const string mountable_device = partition.target_path;
   if (mountable_device.empty()) {
     LOG(ERROR) << "Cannot make mountable device from " << partition.target_path;
     return CompletePostinstall(ErrorCode::kPostinstallRunnerError);