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A head crash, one type of disk failure. The platters should normally be smooth in modern drives, and a head crash results in partial to total data loss, as well as irreversible damage to the platters and heads. Particles may also be liberated during this process, making the insides of the drive not clean enough for operation.
The Federal Reserve has expanded its balance sheet greatly through three quantitative easing periods since the financial crisis of 2007–2008.In September 2019, a spike in the overnight repo market interest rate caused the Federal Reserve to introduce a fourth round of quantitative easing; the balance sheet would expand parabolically following the stock market crash.