Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7312943 | Read write (RW) head position control for self servo writing process The present invention provides a method of generating magnetic reference patterns on a disk or other magnetic media. This involves writing a first magnetic reference pattern to the disk with a servo writer. The disk may then be transferred to a hard disk drive. Cont... | 12/25/2007 |
| 6347353 | Information medium having digital signals recorded thereon An information medium having digital signals recorded therein includes a disk having first and second recording surfaces. The digital signals are in the form of a data frame including a lead-in block and n data blocks. The lead-in block has a same format ... | 02/12/2002 |
| 6154806 | Method for recording digital signals on multiple-layered disks A method of recording digital signals on a disk having at least a first recording surface and a second recording surface. The digital signals are in the form of a data frame including a lead-in block and n data blocks. The lead-in block has a same format ... | 11/28/2000 |
| 4894728 | Data acquisition and recording system A portable, self-contained data acquisition and recording system is provided for monitoring ambulatory subjects. The system has micropower requirements and an extended recording capability between battery replacements. A prepolarized magnetic tape is empl... | 01/16/1990 |
| 4825403 | Apparatus guaranteeing that a controller in a disk drive system receives at least some data from an invalid track sector An apparatus provides a sequence detected signal indicating that a synchronization sequence occurring at regular intervals in a stream of data has occurred or should have occurred. The apparatus includes logic for detecting the synchronization sequence, l... | 04/25/1989 |
| 4723180 | Intermittent drive type magnetic recording apparatus A motor drive amount correction signal generating circuit (14) corrects a deviation of an intermittent feed amount of a magnetic tape (1) by using reverse rotation pulse groups (t1, t2, t3, etc.) or forward rotation pulse ... | 02/02/1988 |
| 4695781 | Digital time interval measuring apparatus A time interval measuring apparatus includes a single main counter, and a plurality of latch circuits each for latching the count content of the main counter every time a plurality of different pulses are supplied thereto. In this apparatus, one of the co... | 09/22/1987 |
| 4636893 | Piezoelectric driven mass storage A planar array of high track density magnetic heads is mounted on a piezoelectric structural member. The heads are in contact with an area of magnetic recording medium coated onto a stationary support member located adjacent the head array structure. A re... | 01/13/1987 |
| 4151564 | Modular, semiautomatic credit card reader/writer apparatus A reader/writer credit card modular assembly wherein a T-shaped vertically disposed rail member provides accurate positioning of a credit card relative to a read/write transducer and to a timing track transducer through a reference plane established by me... | 04/24/1979 |
| 3932894 | Magnetic record member for use with rotating head magnetic recording apparatus An elongated magnetic tape has a pair of longitudinally extending servo track areas, one of which is closer to the longitudinal center of the tape than the other. The lateral space intermediate the servo areas receives data signals, while the space betwee... | 01/13/1976 |
