astronomy

Travelstar

Travelstar is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Travelstar rather than just read about it. In short: Travelstar is a brand of discontinued 2.5-inch hard disk drive (HDD) that was introduced by IBM in 1994 with the announcement of the Travelstar LP. At 12.5 mm high with two platters, they were available in 360, 540 and 720 MB capacities.

Key takeaways

Travelstar belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Travelstar to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Travelstar from memory before moving on to harder problems.

Reference excerpt

Travelstar is a brand of discontinued 2.5-inch hard disk drive (HDD) that was introduced by IBM in 1994 with the announcement of the Travelstar LP. At 12.5 mm high with two platters, they were available in 360, 540 and 720 MB capacities. Initial models were industry-leading for small form factor HDDs in terms of areal density (644 Mb/in2), data transfer rates (11.1 MB/sec) and shock tolerance (500g). These drives were typically used with laptop computers and small form factor desktop computers. Models were manufactured with capacities up to 1 TB, with rotational speeds of 5400 rpm or 7200 rpm and in 7 mm or 9.5 mm package heights. Older models were offered with the Parallel ATA interface and some in a 1.8" form factor. In 1990 IBM began shipping 2.5-inch HDDs without this branding. Newer Travelstar drives were manufactured with the Serial ATA interface. The brand was adopted and renamed to "HGST Travelstar" by Hitachi Global Storage Technologies after they acquired IBM's HDD business in 2003 and continued for a while after HGST's 2.5-inch drive plant in Thailand, Toshiba Storage Device Co. Ltd., was acquired by Western Digital in 2012, but the HGST prefix is now defunct.

The Travelstar Z5K500 and Z7K500, announced in 2012, had a z-height of 7mm, 1 platter and 2 heads. The Z5K500 and Z7K500 had drive capacities of 250, 320, and 500GB capacities and 8,16 and 32MB of cache with a speed of 5400 or 7200 RPM. Western Digital later "updated" the line by rebranding a WD Blue drive to the Z5K500.B and WD Black to Z7K500.B, the Z5K500.B can only be configured with 16 MB cache while the Z7K500.B is only available with 32MB cache. In 2017 Western Digital released the Z5K1, a 7mm 1TB hard drive that is the only HGST drive to ever feature drive-managed SMR. As of 2024 this drive is no longer offered for sale by Western Digital.

Illustrations

Worked examples

Example 1 — a first encounter with Travelstar

Start with the simplest possible case. Write down what Travelstar claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Travelstar before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Travelstar ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Travelstar

In research: Travelstar appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Travelstar in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Travelstar is common in secondary-school and first-year university syllabi. It links to neighbouring topics Computer hardware stubs, Divested IBM products, Hard disk drives, so understanding it makes those chapters shorter.
In everyday life: Look for Travelstar outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Travelstar in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Travelstar means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Travelstar out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Travelstar in simple terms?

Why does Travelstar matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Travelstar?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Travelstar.