Showa Denko Global Network

Our Technology

Media Manufacturing Process

HDD areal densities have been growing at compound annual growth rate of 60 -- 100% for many years. This trend does not seem to be abating with growing demand for conventional computers and new emerging markets such as consumer electronics. SHDS continues to advance its technology to keep pace with this burgeoning market.

STEP 1 - Substrates

3.5" aluminium or 2.5" glass substrates are processed.

STEP 2 - Texture

Substrates are polished to create texture patterns on the disk surface. Texturing is done for the purpose of removing substrate level defects. In addition inducing a specified level of roughness to prevent stiction between the head-disk interface. Finally it is done for aiding magnetic anisotropy in the sputtering process.

STEP 3 - Wash

All particulate contaminations must be removed and the disk surface must be perfectly cleaned and dry before entering the vacuum sputtering process.

STEP 4 - Sputter

Magnetic thin film layers are sputtered onto the disk surface Areal densities for media are primarily determined by this process. Substrates take on magnetic properties after various layers of magnetic alloys are sputtered onto them. A carbon layer finish is applied to make the media more robust and durable.

STEP 5 - Lubrication

A layer of solvent based lubricants are coated over the disk surface to enhance durability and media reliability performance.

STEP 6 - Tape Burnish

An abrasive tape is used to remove any asperities on the disk before testing.

STEP 7 - Testing

Disk is sent for mechanical and parametric testing.

STEP 8 - Packing

All disks that pass testing are then sealed in a vacuum package, ready for shipment to customers.

Disclaimer: Manufacturing flow may be modified depending on program requirements.