The Deskstar is the name of a product line of computer hard drives. Product lining is the Marketing strategy of offering for sale several related products. A hard disk drive ( HDD) commonly referred to as a hard drive, hard disk, or fixed disk drive, is a Non-volatile storage device It was originally produced by IBM until Hitachi bought IBM's hard drive division in 2002. International Business Machines Corporation abbreviated IBM and nicknamed "Big Blue", is a multinational Computer Technology () is a Multinational corporation specializing in high-technology and services headquartered in Marunouchi Itchome Chiyoda, Tokyo, Japan. International Business Machines Corporation abbreviated IBM and nicknamed "Big Blue", is a multinational Computer Technology From then on it was called the Hitachi Deskstar.
The last of the Deskstar series produced under IBM name was the 180GXP.
After Hitachi had acquired IBM's storage division, Hitachi still sold Deskstar 120GXP and Deskstar 180GXP, but under the Hitachi brand.
The IBM Deskstar 75GXP, and several other models made around the same time, became infamous for their reportedly high failure rates. This led to the drives being colloquially referred to as "Deathstars". The Death Star is a Fictional Space station and Superweapon appearing in the Star Wars movies and expanded universe.
Despite failures being reported within the manufacturer warranty period (3 years), Michael T. Granito, Jr. , an American user of IBM's 75GXP hard drive, filed a class-action lawsuit against IBM on 2001-10-16 for defects in the product causing it to "crash".  Without admitting responsibility, IBM settled this lawsuit in 2005. 
A firmware update (details) gives a clue to some of the issues:
The drives were also known for commonly head crashing. Wear levelling (also written wear leveling) is a technique for prolonging the Service life of some kinds of erasable Computer storage media such as A head crash is a specific type of Hard disk failure, and occurs when the read-write head of a Hard disk drive touches its rotating platter The combination of two relatively new (at the time) technologies, GMR heads and glass platters may be largely to blame for the issues. Giant magnetoresistance (GMR is a quantum mechanical effect a type of Magnetoresistance effect observed in thin film structures composed of alternating Ferromagnetic
In addition to the failure that had led to the lawsuit, additional flaws were found in Deskstar 60GXP, 75GXP, 120GXP, 180GXP, which are caused by Giant Magneto Resistive read / write heads, and the easily corrupted NVRAM chip. 
Since the filing of lawsuit, IBM unveiled Deskstar 120GXP, Travelstar 60GH and 40GN in 2001-11-07. Year 2001 ( MMI) was a Common year starting on Monday according to the Gregorian calendar. Events 1492 - The Ensisheim Meteorite the oldest Meteorite with a known date of impact strikes the Earth around noon in a Wheat  The Deskstar documentation was updated to show the drives had been rated to 333 power-on hours per month (45 percent), leading to speculation that was the result of the lawsuit. However, IBM spokesperson replied that the rating is not new at the time. 
In June 2002, Hitachi and IBM reached a framework agreement under which Hitachi would purchase IBM's HDD operations. The deal was closed on 2002-03-31. On 2003-01-06, Hitachi announced the new hard disk drive storage company is named Hitachi Global Storage Technologies. Hitachi Global Storage Technologies is a wholly owned subsidiary of Hitachi Ltd  After finalising the sale of the storage division, IBM announced taking $2 billion charge in its second quarter.