NewEgg reviews shows that other users have had the same problem and that Hitachi support said to get it replaced.

https://www.newegg.com/global/sg/Product/SingleProductReview.aspx?ReviewID=4331255

05/20/2015

This review is from: HGST Travelstar 7K1000 HTS721010A9E630 (0J22423) 1TB 7200 RPM 32MB Cache SATA 6.0Gb/s 2.5" Internal Notebook Hard Drive (Standard model) Bare Drive

Pros:

None

Cons:

Purchased it and after installation, though it was very quiet when flat, but every time I tilted the laptop it sounded like someone getting a buzzcut. Loud and not healthy. HGST tech support said to have Newegg exchange it.

2nd one, the replacement, didn't have the buzzing noise when tilted, But, it ran very loud like an old tower.

Returned it for store credit and will be trying to get a Seagate. Newegg customer service was very good, but this item was very bad.

NewEgg reviews shows that other users have had the same problem and that HGST support said to get it replaced.

https://www.newegg.com/global/sg/Product/SingleProductReview.aspx?ReviewID=4331255

05/20/2015

This review is from: HGST Travelstar 7K1000 HTS721010A9E630 (0J22423) 1TB 7200 RPM 32MB Cache SATA 6.0Gb/s 2.5" Internal Notebook Hard Drive (Standard model) Bare Drive

Pros:

None

Cons:

Purchased it and after installation, though it was very quiet when flat, but every time I tilted the laptop it sounded like someone getting a buzzcut. Loud and not healthy. HGST tech support said to have Newegg exchange it.

2nd one, the replacement, didn't have the buzzing noise when tilted, But, it ran very loud like an old tower.

Returned it for store credit and will be trying to get a Seagate. Newegg customer service was very good, but this item was very bad.