diff --git a/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPartPlanFile.cs b/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPartPlanFile.cs
index 9859216de85c0..55eb6d9854aca 100644
--- a/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPartPlanFile.cs
+++ b/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPartPlanFile.cs
@@ -29,8 +29,6 @@ internal class JobPartPlanFile : IDisposable
         /// </summary>
         public readonly SemaphoreSlim WriteLock;
 
-        private const int DefaultBufferSize = 81920;
-
         private JobPartPlanFile()
         {
             WriteLock = new SemaphoreSlim(1);
@@ -66,7 +64,10 @@ public static async Task<JobPartPlanFile> CreateJobPartPlanFileAsync(
             {
                 using (FileStream fileStream = File.Create(result.FileName.ToString()))
                 {
-                    await headerStream.CopyToAsync(fileStream, DefaultBufferSize, cancellationToken).ConfigureAwait(false);
+                    await headerStream.CopyToAsync(
+                        fileStream,
+                        DataMovementConstants.DefaultStreamCopyBufferSize,
+                        cancellationToken).ConfigureAwait(false);
                 }
             }
             catch (Exception)
diff --git a/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPlanFile.cs b/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPlanFile.cs
index d9482a8fc0d83..022efff83ddf5 100644
--- a/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPlanFile.cs
+++ b/sdk/storage/Azure.Storage.DataMovement/src/JobPlan/JobPlanFile.cs
@@ -35,8 +35,6 @@ internal class JobPlanFile : IDisposable
         /// </summary>
         public readonly SemaphoreSlim WriteLock;
 
-        private const int DefaultBufferSize = 81920;
-
         private JobPlanFile(string id, string filePath)
         {
             Id = id;
@@ -63,7 +61,10 @@ public static async Task<JobPlanFile> CreateJobPlanFileAsync(
             {
                 using (FileStream fileStream = File.Create(jobPlanFile.FilePath))
                 {
-                    await headerStream.CopyToAsync(fileStream, DefaultBufferSize, cancellationToken).ConfigureAwait(false);
+                    await headerStream.CopyToAsync(
+                        fileStream,
+                        DataMovementConstants.DefaultStreamCopyBufferSize,
+                        cancellationToken).ConfigureAwait(false);
                 }
             }
             catch (Exception)
diff --git a/sdk/storage/Azure.Storage.DataMovement/src/LocalFileStorageResource.cs b/sdk/storage/Azure.Storage.DataMovement/src/LocalFileStorageResource.cs
index f9a231c0047ff..1d13dfeed1238 100644
--- a/sdk/storage/Azure.Storage.DataMovement/src/LocalFileStorageResource.cs
+++ b/sdk/storage/Azure.Storage.DataMovement/src/LocalFileStorageResource.cs
@@ -142,11 +142,9 @@ protected internal override async Task CopyFromStreamAsync(
                     {
                         fileStream.Seek(position, SeekOrigin.Begin);
                     }
-                    await stream.CopyToAsync(
-                        fileStream,
-                        (int)streamLength,
-                        cancellationToken)
-                        .ConfigureAwait(false);
+
+                    int bufferSize = Math.Min((int)streamLength, DataMovementConstants.DefaultStreamCopyBufferSize);
+                    await stream.CopyToAsync(fileStream, bufferSize, cancellationToken).ConfigureAwait(false);
                 }
             }
         }
diff --git a/sdk/storage/Azure.Storage.DataMovement/src/LocalTransferCheckpointer.cs b/sdk/storage/Azure.Storage.DataMovement/src/LocalTransferCheckpointer.cs
index a8105e1f06c1e..7034c19ebb414 100644
--- a/sdk/storage/Azure.Storage.DataMovement/src/LocalTransferCheckpointer.cs
+++ b/sdk/storage/Azure.Storage.DataMovement/src/LocalTransferCheckpointer.cs
@@ -152,8 +152,8 @@ public override async Task<Stream> ReadJobPlanFileAsync(
             int length,
             CancellationToken cancellationToken = default)
         {
-            int maxArraySize = length > 0 ? length : DataMovementConstants.DefaultArrayPoolArraySize;
-            Stream copiedStream = new PooledMemoryStream(ArrayPool<byte>.Shared, maxArraySize);
+            int bufferSize = length > 0 ? length : DataMovementConstants.DefaultStreamCopyBufferSize;
+            Stream copiedStream = new PooledMemoryStream(ArrayPool<byte>.Shared, bufferSize);
 
             CancellationHelper.ThrowIfCancellationRequested(cancellationToken);
             if (_transferStates.TryGetValue(transferId, out JobPlanFile jobPlanFile))
@@ -164,7 +164,7 @@ public override async Task<Stream> ReadJobPlanFileAsync(
                     using (MemoryMappedFile mmf = MemoryMappedFile.CreateFromFile(jobPlanFile.FilePath))
                     using (MemoryMappedViewStream mmfStream = mmf.CreateViewStream(offset, length, MemoryMappedFileAccess.Read))
                     {
-                        await mmfStream.CopyToAsync(copiedStream).ConfigureAwait(false);
+                        await mmfStream.CopyToAsync(copiedStream, bufferSize, cancellationToken).ConfigureAwait(false);
                     }
 
                     copiedStream.Position = 0;
@@ -193,8 +193,8 @@ public override async Task<Stream> ReadJobPartPlanFileAsync(
             {
                 if (jobPlanFile.JobParts.TryGetValue(partNumber, out JobPartPlanFile jobPartPlanFile))
                 {
-                    int maxArraySize = length > 0 ? length : DataMovementConstants.DefaultArrayPoolArraySize;
-                    Stream copiedStream = new PooledMemoryStream(ArrayPool<byte>.Shared, maxArraySize);
+                    int bufferSize = length > 0 ? length : DataMovementConstants.DefaultStreamCopyBufferSize;
+                    Stream copiedStream = new PooledMemoryStream(ArrayPool<byte>.Shared, bufferSize);
 
                     await jobPartPlanFile.WriteLock.WaitAsync(cancellationToken).ConfigureAwait(false);
                     try
@@ -202,7 +202,7 @@ public override async Task<Stream> ReadJobPartPlanFileAsync(
                         using (MemoryMappedFile mmf = MemoryMappedFile.CreateFromFile(jobPartPlanFile.FilePath))
                         using (MemoryMappedViewStream mmfStream = mmf.CreateViewStream(offset, length, MemoryMappedFileAccess.Read))
                         {
-                            await mmfStream.CopyToAsync(copiedStream).ConfigureAwait(false);
+                            await mmfStream.CopyToAsync(copiedStream, bufferSize, cancellationToken).ConfigureAwait(false);
                         }
 
                         copiedStream.Position = 0;
diff --git a/sdk/storage/Azure.Storage.DataMovement/src/Shared/DataMovementConstants.cs b/sdk/storage/Azure.Storage.DataMovement/src/Shared/DataMovementConstants.cs
index 6040d691298a3..21e598241225b 100644
--- a/sdk/storage/Azure.Storage.DataMovement/src/Shared/DataMovementConstants.cs
+++ b/sdk/storage/Azure.Storage.DataMovement/src/Shared/DataMovementConstants.cs
@@ -14,7 +14,7 @@ internal class DataMovementConstants
         internal const int MaxJobPartReaders = 64;
         internal const int MaxJobChunkTasks = 3000;
         internal const int StatusCheckInSec = 10;
-        internal const int DefaultArrayPoolArraySize = 4 * 1024;
+        internal const int DefaultStreamCopyBufferSize = 81920;  // Use the .NET default
 
         internal const long DefaultInitialTransferSize = 32 * Constants.MB;
         internal const long DefaultChunkSize = 4 * Constants.MB;
diff --git a/sdk/storage/Azure.Storage.DataMovement/src/UriToStreamJobPart.cs b/sdk/storage/Azure.Storage.DataMovement/src/UriToStreamJobPart.cs
index b271dbdee4170..ecaed741f19a0 100644
--- a/sdk/storage/Azure.Storage.DataMovement/src/UriToStreamJobPart.cs
+++ b/sdk/storage/Azure.Storage.DataMovement/src/UriToStreamJobPart.cs
@@ -472,7 +472,7 @@ public async Task WriteChunkToTempFile(string chunkFilePath, Stream source)
             {
                 await source.CopyToAsync(
                     fileStream,
-                    Constants.DefaultDownloadCopyBufferSize,
+                    DataMovementConstants.DefaultStreamCopyBufferSize,
                     _cancellationToken)
                     .ConfigureAwait(false);
             }