diff --git a/configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py b/configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py
index 0bd5320..5624eaf 100644
--- a/configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py
+++ b/configs/example/gem5_library/x86-spec-cpu2006-benchmarks.py
@@ -65,7 +65,7 @@
 from gem5.components.processors.cpu_types import CPUTypes
 from gem5.isas import ISA
 from gem5.coherence_protocol import CoherenceProtocol
-from gem5.resources.resource import Resource, CustomResource
+from gem5.resources.resource import Resource, CustomDiskImageResource
 
 from m5.stats.gem5stats import get_simstat
 from m5.util import warn
@@ -227,15 +227,6 @@
 
 command = "{} {} {}".format(args.benchmark, args.size, output_dir)
 
-# For enabling CustomResource, we pass an additional parameter to mount the
-# correct partition.
-
-metadata = {
-    "additional_metadata" : {
-        "root_partition" : args.partition,
-    },
-}
-
 board.set_kernel_disk_workload(
     # The x86 linux kernel will be automatically downloaded to the
     # `~/.cache/gem5` directory if not already present.
@@ -245,9 +236,9 @@
         "x86-linux-kernel-4.19.83",
     ),
     # The location of the x86 SPEC CPU 2017 image
-    disk_image=CustomResource(
+    disk_image=CustomDiskImageResource(
         args.image,
-        metadata=metadata
+        disk_root_partition=args.partition,
     ),
     readfile_contents=command,
 )
diff --git a/configs/example/gem5_library/x86-spec-cpu2017-benchmarks.py b/configs/example/gem5_library/x86-spec-cpu2017-benchmarks.py
index b4bb9ac..25bbbea 100644
--- a/configs/example/gem5_library/x86-spec-cpu2017-benchmarks.py
+++ b/configs/example/gem5_library/x86-spec-cpu2017-benchmarks.py
@@ -63,7 +63,7 @@
 from gem5.components.processors.cpu_types import CPUTypes
 from gem5.isas import ISA
 from gem5.coherence_protocol import CoherenceProtocol
-from gem5.resources.resource import Resource, CustomResource
+from gem5.resources.resource import Resource, CustomDiskImageResource
 
 from m5.stats.gem5stats import get_simstat
 from m5.util import warn
@@ -236,12 +236,6 @@
 # For enabling CustomResource, we pass an additional parameter to mount the
 # correct partition.
 
-metadata = {
-    "additional_metadata" : {
-        "root_partition" : args.partition,
-    },
-}
-
 board.set_kernel_disk_workload(
     # The x86 linux kernel will be automatically downloaded to the
     # `~/.cache/gem5` directory if not already present.
@@ -250,10 +244,10 @@
         "x86-linux-kernel-4.19.83",
     ),
     # The location of the x86 SPEC CPU 2017 image
-    disk_image=CustomResource(
+    disk_image=CustomDiskImageResource(
         args.image,
-        metadata=metadata
-        ),
+        disk_root_partition=args.partition,
+    ),
     readfile_contents=command,
 )
 
diff --git a/src/python/gem5/resources/resource.py b/src/python/gem5/resources/resource.py
index b316f7d..f03490b 100644
--- a/src/python/gem5/resources/resource.py
+++ b/src/python/gem5/resources/resource.py
@@ -80,6 +80,36 @@
         """
         super().__init__(local_path=local_path, metadata=metadata)
 
+class CustomDiskImageResource(CustomResource):
+    """
+    A custom disk image gem5 resource. It can be used to specify a custom,
+    local disk image.
+    """
+
+    def __init__(
+        self,
+        local_path: str,
+        disk_root_partition: Optional[str] = None,
+        metadata: Dict = {},
+    ):
+        """
+        :param local_path: The path of the disk image on the host system.
+        :param disk_root_partition: The root disk partition to use.
+        :param metadata: Metadata for the resource.
+        """
+
+        # Behind the scenes, we set the the root partition via the metadata.
+        # For a traditional, non-custom, resource it is the metadata that is
+        # used to specify the disk image partition root. Therefore, when the
+        # root disk partition specified during the construction, we apply it as
+        # metadata.
+        if disk_root_partition:
+            disk_root_partition_dict = {
+                "additional_metadata": {"root_partition": disk_root_partition}
+            }
+            metadata.update(disk_root_partition_dict)
+
+        super().__init__(local_path=local_path, metadata=metadata)
 
 class Resource(AbstractResource):
     """