IBM Cloud

Mount an IBM Cloud Object Storage bucket as a Windows drive.

Before you begin

Prepare the following in advance:

• HMAC credentials for your Cloud Object Storage instance — an IAM API key alone does not work with the S3 interface.

Where to get the keys — in the IBM Cloud console:

1. Open your Cloud Object Storage instance → Service credentials.
2. Click New credential, expand Advanced options, and turn on Include HMAC Credential.
3. In the created credential, copy cos_hmac_keys.access_key_id and secret_access_key.

Help from IBM

• Using HMAC credentials
• Cloud Object Storage documentation

Connect

1. Click Add in the toolbar.
2. Choose Enterprise → IBM Cloud.
3. Enter the Access Key ID and Secret Access Key, then click the Refresh button next to the bucket field.
4. Select the bucket and click Connect.

Manual bucket entry

If your key is not allowed to list buckets, tick the checkbox to the left of the bucket field and type the bucket name directly.

Settings

Setting	Description	Default
Access Key ID / Secret Access Key	HMAC credential of the COS instance	—
Bucket	The bucket to mount (list or manual entry)	—
Read-only	Blocks writes to the mounted drive	off

Behavior & limits

• Buckets are listed together with their location — regional endpoints follow s3.<region>.cloud-object-storage.appdomain.cloud (us-south, us-east, eu-de, eu-gb, au-syd, …).
• An API key alone is not enough for the S3 interface — it must be the HMAC key pair.

Troubleshooting

Symptom	Cause	Fix
Authentication fails	Service credential created without HMAC	Re-create the credential with Include HMAC Credential on
Bucket missing from the list	Bucket belongs to another COS instance	Use the credential of the instance that owns the bucket