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A five-piece drum kit in hard drum cases. A drum case is a piece of luggage used by drummers and percussionists to transport their instruments, hardware, and accessories.Hard drum cases may be made of vulcanized fiber, molded plastic, or plywood, while soft drum cases may be made of nylon, cordura, or polyester. [1]
Drum memory of a Polish ZAM-41 computer Drum memory from the BESK computer, Sweden's first binary computer, which made its debut in 1953. Drum memory was a magnetic data storage device invented by Gustav Tauschek in 1932 in Austria. [1] [2] Drums were widely used in the 1950s and into the 1960s as computer memory.
The IBM 2301 is a magnetic drum storage device introduced in the late 1960s to "provide large capacity, direct access storage for IBM System/360 Models 65, 67, 75, or 85." The vertically mounted drum rotates at around 3,500 revolutions per minute, and has a head-per-track access mechanism and a capacity of 4 MB.
Despite the name, FASTRAND was slow. The head positioning time was significant, so software allocated storage by tracks (1,792 words, 10,752 characters or 8,064 eight-bit bytes) or "positions", a group of 64 tracks (114,688 words, 688,128 characters or 510,096 eight-bit bytes) which were under the heads at a single time.
Amazon Music storage, started in March 2009, offered storage space for 250 uploaded tracks (MP3 or AAC up to 100 MB each) in free version or 250,000 tracks in premium version, as well as web players for major operating systems, Fire TV, Roku, and Sonos sound systems. Amazon did not allow podcasts, ringtones, or audiobooks to be uploaded. [29]
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