3 results about "Recording density" patented technology

Provided are a magnetic tape winding method and a magnetic tape device, and the technical field relates to storage technology. The method is applied to a magnetic tape device, and the magnetic tape device comprises a magnetic tape, a first winding drum and a second winding drum, and the first winding drum and the second winding drum are used for winding the magnetic tape. The method comprises the following steps: determining a creep state of the magnetic tape, the creep state comprising a first creep variable of the magnetic tape on the first winding drum side and a second creep variable of the magnetic tape on the second winding drum side; determining a standby winding state of the magnetic tape based on the creep state, the standby winding state being one of at least one winding state of the magnetic tape, and the same part of the magnetic tape being subjected to different stresses in different winding states; and driving the magnetic tape to be wound, so that the magnetic tape is in the standby winding state after being wound. In this way, the occurrence or severity of the magnetic tape winding creep can be inhibited, the stress borne by the whole magnetic tape is balanced, the track tracking error caused by the winding creep is inhibited, the recording density and the track tracking accuracy of the magnetic tape are improved, and thus the data read-write capability of the magnetic tape is improved.

This invention provides a method, apparatus, computer device, and storage medium for storing sensing data, relating to the field of data storage technology. The method includes: calculating the environmental state similarity between adjacent acquisition times based on environmental state vectors at each acquisition time; aggregating and storing storage entries corresponding to consecutively occurring identical environmental states at each acquisition time based on a comparison of the environmental state similarity between adjacent acquisition times and a dynamic threshold, forming storage records; calculating the current storage record density and the environmental state change frequency of each storage record based on the storage records, and then generating a hierarchical storage strategy through preset storage rules; and performing hierarchical storage of the environmental state vectors and storage records based on the hierarchical storage strategy. The technical solution provided by this invention effectively removes spatiotemporal repetition information when storing sensing data, saves storage space for edge devices, improves data processing efficiency, and extends hardware lifespan.

A test pattern is printed that allows for easy verification of the possibility of ink dripping on the media when confirming the maximum amount of ink ejected per unit area from the print head. [Solution] A printing apparatus comprising: a transport unit for transporting a medium in a transport direction; a print head capable of ejecting ink onto the medium; and a control unit for controlling the printing of a test pattern for determining the maximum amount of ink to be ejected per unit area of ​​the medium from the print head, wherein the test pattern has a continuous region in which the ink is continuous at a set recording density and the surrounding continuous region is not ejected with respect to the length in the width direction intersecting the transport direction, and the width of the end of the continuous region that is furthest downstream or furthest upstream in the transport direction is narrower than the maximum width of the continuous region, and the control unit controls at least the print head to print the test pattern having the continuous region.