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  2. Ultimate Boot CD - Wikipedia

    en.wikipedia.org/wiki/Ultimate_Boot_CD

    The Ultimate Boot CD contains freeware and open-source diagnostic tools from a variety of sources. Many of these tools were originally designed to boot from a floppy disk drive. The Ultimate Boot CD made it possible to run them on a PC without a floppy drive. [5] UBCD can also run from USB for computers without an optical drive. [5]

  3. Data recovery - Wikipedia

    en.wikipedia.org/wiki/Data_recovery

    The most common data recovery scenarios involve an operating system failure, malfunction of a storage device, logical failure of storage devices, accidental damage or deletion, etc. (typically, on a single-drive, single-partition, single-OS system), in which case the ultimate goal is simply to copy all important files from the damaged media to another new drive.

  4. macOS version history - Wikipedia

    en.wikipedia.org/wiki/MacOS_version_history

    It has better performance and provided missing features, such as DVD playback. Apple released 10.1 as a free upgrade CD for 10.0 users. Apple released a US$129 upgrade CD for Mac OS 9. On January 7, 2002, Apple announced that Mac OS X was to be the default operating system for all Macintosh products by the end of that month. [43]

  5. Chromosome 15 - Wikipedia

    en.wikipedia.org/wiki/Chromosome_15

    Chromosome 15 is one of the 23 pairs of chromosomes in humans.People normally have two copies of this chromosome. Chromosome 15 spans about 99.7 million base pairs (the building material of DNA) and represents between 3% and 3.5% of the total DNA in cells.

  6. National debt of the United States - Wikipedia

    en.wikipedia.org/wiki/National_debt_of_the...

    Detailed breakdown of government holders of treasury debt and debt instruments used of the public portion. As of July 20, 2020, debt held by the public was $20.57 trillion, and intragovernmental holdings were $5.94 trillion, for a total of $26.51 trillion. [20]

  7. Viscosity - Wikipedia

    en.wikipedia.org/wiki/Viscosity

    Viscosity is a measure of a fluid's rate-dependent resistance to a change in shape or to movement of its neighboring portions relative to one another. [1] For liquids, it corresponds to the informal concept of thickness; for example, syrup has a higher viscosity than water. [2]

  8. IEEE 802.15.4 - Wikipedia

    en.wikipedia.org/wiki/IEEE_802.15.4

    IEEE 802.15.4 protocol stack. Devices are designed to interact with each other over a conceptually simple wireless network.The definition of the network layers is based on the OSI model; although only the lower layers are defined in the standard, interaction with upper layers is intended, possibly using an IEEE 802.2 logical link control sublayer accessing the MAC through a convergence sublayer.