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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters. You can also try the grid of 16 letters. Letters must be adjacent and longer words score better. See if you can get into the grid Hall of Fame !
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Tips: browse the semantic fields (see From ideas to words) in two languages to learn more.
DDS uses tape with a width of 3.8mm, with the exception of the latest formats, DAT 160 and DAT 320, which are 8mm wide. Initially, the tape was 60 meters (197 feet) or 90 meters (295 ft.) long, although advancements in materials technology have allowed the length to be increased significantly in successive versions. A DDS tape drive uses helical scanning for recording, the same process used by a video cassette recorder (VCR). If errors are present, the write heads rewrite the data.
Backward compatibility between newer drives and older tapes is not assured; for examples, see HP's DDS Media Compatibility Matrix. (Notice in HP's article that newer tape standards do not simply consist of longer tapes; with DDS2, for example, the track was narrower than with DDS1.)
Stores up to 1.3 GB uncompressed (2.6 GB compressed) on a 60 m cartridge, 2 GB uncompressed (4 GB compressed) on a 90 m cartridge.
The DDS-1 Cartridge often does not have the -1 designation. It can often be recognized by having 4 vertical bars separated from DDS by the words e "Digital Data Storage"..
Stores up to 4 GB uncompressed (8 GB compressed) on a 120 m cartridge.
Stores up to 12 GB uncompressed (24 GB compressed) on a 125 m cartridge. DDS-3 uses PRML (Partial Response Maximum Likelihood). PRML minimizes electronic noise for a cleaner data recording.
DDS-4 stores up to 20 GB uncompressed (40 GB compressed) on a 150 m cartridge. This format is also called DAT 40.
DAT 72 stores up to 36 GB uncompressed (72 GB compressed) on a 170 m cartridge. The DAT 72 standard was developed by HP and Certance. It has the same form-factor and is backwards compatible with DDS-3 and -4.
DAT 160 was launched in June 2007 by HP, stores up to 80 GB uncompressed (160 GB compressed). A major change from the previous generations is the width of the tape. DAT 160 uses 8 mm wide tape while all prior versions use 3.81 mm wide tape. Despite the difference in tape widths, DAT 160 drives are backwards compatible with DAT 72 and DAT 40 (DDS-4). Native capacity is 80 GB and native transfer rate 6.9 MB/s. Launch interfaces are SCSI and USB, with SAS interface now released.
In November 2009 HP launched the new DAT 320 which stores up to 160 GB uncompressed (marketed as 320 GB assuming 2:1 compression).
The next format, Gen 8, is expected to store approximately 300 GB uncompressed..