The recent run-up in the market would make it easy to justify selling any stock these days. Yet, while panic never helps investors, it's still a good idea to play devil's advocate with investments.

Consider disk-drive maker Seagate Technology (Nasdaq: STX). Though the market for computer storage remains strong, you'll find that a few of the 1,007 Motley Fool CAPS members weighing in on the company offer reasons to be bearish.

Here at The Motley Fool, we like to consider both the good and the bad sides of an investment, so in this article, so I'm highlighting three of the main bearish arguments on Seagate Technology today. Be sure to read the bullish side as well, and then weigh in with your own comments below or rate Seagate Technology in CAPS.                                            

1. Competition
In the fourth quarter, Western Digital (NYSE: WDC) was right on Seagate's heels, with its market share trailing Seagate's by a razor-thin 1 percentage point. Analysts at Wedbush Securities expect competition to heat up as Western Digital pushes forward in the enterprise space, and they anticipate pricing pressure as more capacity comes into the market. All the competition and expanded offerings point to pressure on Seagate's bottom line.

2. Shifting technology
Some CAPS members argue that hard-disk drives eventually will take a back seat to more efficient technology like flash and solid state drives (SSD). Flash memory maker SanDisk (Nasdaq: SNDK) is working its way into the netbook market, and tablets like the Apple (Nasdaq: AAPL) iPad are already making use of flash memory. While Seagate recently released a solid state drive of its own, some investors see SSD makers such as STEC (Nasdaq: STEC) and Intel (Nasdaq: INTC) as being farther ahead in the game.                           

3. Run its course
While stocks across many areas of tech like Advanced Micro Devices and Fairchild Semiconductor International have offered big gains in the past year, Seagate has given investors big returns, too. With questions about Seagate's competitive position in the coming years against newer technologies, some investors consider now a good time to cash out.                           

To see details of what CAPS members are saying now about Seagate Technology, just click on over to Motley Fool CAPS and have a look -- or add your own thoughts directly to this story in the comments box below.

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Fool contributor Dave Mock has more than three reasons to avoid juggling bowling balls. He owns shares of Intel, which is an Inside Value recommendation. Apple is a Stock Advisor choice. The Fool has created a covered strangle position on Intel. Motley Fool Options has recommended a buy calls position on Intel. The Fool's disclosure policynever, ever uses double negatives.