diff --git a/src/main/lombok/org/warp/filesponge/SecureFileAccessor.java b/src/main/lombok/org/warp/filesponge/SecureFileAccessor.java
index ce7e9eb..8c61337 100644
--- a/src/main/lombok/org/warp/filesponge/SecureFileAccessor.java
+++ b/src/main/lombok/org/warp/filesponge/SecureFileAccessor.java
@@ -18,11 +18,11 @@
 
 package org.warp.filesponge;
 
+import java.nio.ByteBuffer;
 import lombok.AllArgsConstructor;
 import lombok.EqualsAndHashCode;
 import org.jetbrains.annotations.NotNull;
 import org.warp.filesponge.api.FileAccessor;
-import org.warp.filesponge.value.FileContent;
 import org.warp.filesponge.value.FileStatus;
 import org.warp.filesponge.value.FileURI;
 import reactor.core.publisher.Mono;
@@ -32,9 +32,9 @@ import reactor.core.publisher.Mono;
  */
 @AllArgsConstructor
 @EqualsAndHashCode
-public class SecureFileAccessor<FURI extends FileURI, FC extends FileContent> implements FileAccessor<FURI, FC> {
+public class SecureFileAccessor<FURI extends FileURI> implements FileAccessor<FURI> {
 
-	private final FileAccessor<FURI, FC> fileAccessor;
+	private final FileAccessor<FURI> fileAccessor;
 
 	@Override
 	public Mono<Void> delete(@NotNull FURI fileURI) {
@@ -42,7 +42,7 @@ public class SecureFileAccessor<FURI extends FileURI, FC extends FileContent> im
 	}
 
 	@Override
-	public Mono<FC> getContent(@NotNull FURI fileURI, boolean offlineOnly) {
+	public Mono<ByteBuffer> getContent(@NotNull FURI fileURI, boolean offlineOnly) {
 		return fileAccessor.getContent(fileURI, offlineOnly);
 	}
 
diff --git a/src/main/lombok/org/warp/filesponge/api/FileAccessor.java b/src/main/lombok/org/warp/filesponge/api/FileAccessor.java
index 12cbbfe..d2a4b82 100644
--- a/src/main/lombok/org/warp/filesponge/api/FileAccessor.java
+++ b/src/main/lombok/org/warp/filesponge/api/FileAccessor.java
@@ -18,8 +18,8 @@
 
 package org.warp.filesponge.api;
 
+import java.nio.ByteBuffer;
 import org.jetbrains.annotations.NotNull;
-import org.warp.filesponge.value.FileContent;
 import org.warp.filesponge.value.FileStatus;
 import org.warp.filesponge.value.FileURI;
 import reactor.core.publisher.Mono;
@@ -27,7 +27,7 @@ import reactor.core.publisher.Mono;
 /**
  * FileAccessor can be used to access files from the client side
  */
-public interface FileAccessor<FURI extends FileURI, FC extends FileContent> {
+public interface FileAccessor<FURI extends FileURI> {
 
 	/**
 	 * Request file deletion
@@ -45,7 +45,7 @@ public interface FileAccessor<FURI extends FileURI, FC extends FileContent> {
 	 * @return content if found. If the request is offline the future will complete instantly.
 	 * Can be empty
 	 */
-	Mono<FC> getContent(@NotNull FURI fileURI, boolean offlineOnly);
+	Mono<ByteBuffer> getContent(@NotNull FURI fileURI, boolean offlineOnly);
 
 	/**
 	 * Get file status
diff --git a/src/main/lombok/org/warp/filesponge/api/FileSpongeClient.java b/src/main/lombok/org/warp/filesponge/api/FileSpongeClient.java
index 5c08562..a2d0a53 100644
--- a/src/main/lombok/org/warp/filesponge/api/FileSpongeClient.java
+++ b/src/main/lombok/org/warp/filesponge/api/FileSpongeClient.java
@@ -19,14 +19,13 @@
 package org.warp.filesponge.api;
 
 import org.warp.filesponge.SecureFileAccessor;
-import org.warp.filesponge.value.FileContent;
 import org.warp.filesponge.value.FileURI;
 import reactor.core.publisher.Mono;
 
 /**
  * FileAccessor can be used to manage FileSponge and access files from the client side
  */
-public interface FileSpongeClient<FURI extends FileURI, FC extends FileContent> extends FileAccessor<FURI, FC> {
+public interface FileSpongeClient<FURI extends FileURI> extends FileAccessor<FURI> {
 
 	Mono<Void> optimizeStorage();
 
@@ -35,7 +34,7 @@ public interface FileSpongeClient<FURI extends FileURI, FC extends FileContent>
 	 *
 	 * @return limited instance of itself
 	 */
-	default FileAccessor<FURI, FC> asFileAccessor() {
+	default FileAccessor<FURI> asFileAccessor() {
 		return new SecureFileAccessor<>(this);
 	}
 }
diff --git a/src/main/lombok/org/warp/filesponge/api/FileStorage.java b/src/main/lombok/org/warp/filesponge/api/FileStorage.java
index e63da88..c09bac0 100644
--- a/src/main/lombok/org/warp/filesponge/api/FileStorage.java
+++ b/src/main/lombok/org/warp/filesponge/api/FileStorage.java
@@ -20,19 +20,38 @@ package org.warp.filesponge.api;
 
 import java.nio.ByteBuffer;
 import org.jetbrains.annotations.NotNull;
-import org.warp.filesponge.value.FileContent;
+import org.jetbrains.annotations.Nullable;
 import org.warp.filesponge.value.FileType;
 import org.warp.filesponge.value.FileURI;
 import org.warp.filesponge.value.MirrorURI;
 import reactor.core.publisher.Mono;
 
-public interface FileStorage<FURI extends FileURI, FTYPE extends FileType, MURI extends MirrorURI, FC extends FileContent> {
+public interface FileStorage<FURI extends FileURI, FTYPE extends FileType, MURI extends MirrorURI> {
 
 	Mono<Void> newFile(@NotNull FURI fileURI, @NotNull FTYPE fileType);
 
-	Mono<FC> readFileData(@NotNull FURI fileURI);
+	Mono<ByteBuffer> readFileData(@NotNull FURI fileURI);
 
-	Mono<Void> setFileData(@NotNull FURI fileURI, long offset, long size, ByteBuffer bytes, long totalSize);
+	/**
+	 * Set a part of file data.
+	 * If file size is 0, the file will be deleted.
+	 * @param fileURI File URI
+	 * @param offset offset of the current data segment
+	 * @param size current data segment size
+	 * @param bytes data segment, can be null if totalSize is 0
+	 * @param totalSize total file size
+	 * @return nothing
+	 */
+	Mono<Void> setFileData(@NotNull FURI fileURI, long offset, long size, @Nullable ByteBuffer bytes, long totalSize);
 
 	Mono<Boolean> hasAllData(@NotNull FURI fileURI);
+
+	/**
+	 * Delete a file
+	 * @param fileURI
+	 * @return
+	 */
+	default Mono<Void> deleteFile(@NotNull FURI fileURI) {
+		return setFileData(fileURI, 0, 0, null, 0);
+	}
 }
diff --git a/src/main/lombok/org/warp/filesponge/value/FileContent.java b/src/main/lombok/org/warp/filesponge/value/FileContent.java
deleted file mode 100644
index ca6d226..0000000
--- a/src/main/lombok/org/warp/filesponge/value/FileContent.java
+++ /dev/null
@@ -1,21 +0,0 @@
-/*
- *     FileSponge
- *     Copyright (C) 2020 Andrea Cavalli
- *
- *     This program is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- *
- *     This program is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with this program.  If not, see <https://www.gnu.org/licenses/>.
- */
-
-package org.warp.filesponge.value;
-
-public interface FileContent {}