* Short-covering helps prevent market from falling sharply
* Gains limited as concerns over oil prices persist
* Hitachi up on sale of HDD business to Western Digital
By Antoni Slodkowski and Ayai Tomisawa
TOKYO, March 8 (Reuters) - Japan's Nikkei benchmark edged higher on Tuesday as investors covered short positions after sharp losses the day before, but future gains are likely to be hard-won due to concerns about the Middle East and oil prices.
Two major deals were applauded by investors with Hitachi gaining on the sale of its hard disk drive operations to Western Digital <WDC.N> for about $4.3 billion, while Terumo Corp <4543.T> climbed on its purchase of U.S. medical device firm CaridianBCT for $2.6 billion. [
] [ ]Despite a rise of around 20 percent in U.S. oil prices over the last two weeks, Japanese stocks have so far proved largely resilient, and the Nikkei added 1.6 percent last week as investors reassessed risk within their equities portfolios instead of moving out of stocks altogether.
"If oil stays in $100-$120 per barrel range for around half a year the global economy could see a severe slowdown, pushing investors away from stocks, so everything depends on the Middle East now", said Koichi Ogawa, chief portfolio manager at Daiwa SB Investments.
"Shares of exporters such as automakers are being pressured by higher oil prices. At the same time it's also hard to buy stocks tied to domestic demand due to political turmoil, with lack of trust in the government undermining the mood of consumers."
A member of parliament from Japan's ruling party called on Tuesday for Japanese Prime Minister Naoto Kan to step down as soon as possible, Kyodo news agency said, as pressure grows on the unpopular premier to resign or call a snap election. [
]By midafternoon the benchmark Nikkei <
> was up 0.3 percent, or 28.84 points, at 10,533.86. The broader Topix index shed 0.1 percent to 940.51.Hitachi Ltd <6501.T> gained 2 percent to 515 yen in heavy trade, while Terumo Corp <4543.T> jumped 3 percent to 4,630 yen.
Analysts said that M&As, buybacks and other corporate activities, which have picked up steam in Japan in recent weeks will support the benchmark in what could be volatile trade before the settlement of Nikkei futures and options this Friday.
"The market's fundamentals are recovering on corporate earnings so sentiment longer term is good. But for the short-term, the market may see some correction due to continuing worries about develoments in the Middle East," said Hajime Nakajima, deputy general manager at Cosmo Securities.
He said support for the Nikkei is seen at its January closing low of 10,237.
Tech shares followed their U.S. counterparts lower after Wells Fargo downgraded the semiconductor sector. The Nasdaq composite index <
> dropped 1.4 percent on Monday.Toshiba Corp <6502.T> fell 0.8 percent to 514 yen and Sony Corp <6758.T> dropped 0.8 percent to 2,902 yen.
Shinsei Bank <8303.T> surged 4.5 percent to 117 yen in active trade after it set the price of its new stock offering for overseas investors at 108 yen per share, a 3.6 percent discount to Monday's closing price of 112 yen.
Morning volume was moderate, with 1.06 billion shares changing hands on the Tokyo stock exchange's first section, with the day's total set to be in line with last week's average daily volume of 2.2 billion shares. (Editing by Edwina Gibbs)