read head การใช้

• Coincident with 58 tracks were 67 read heads and 13 write heads.
• The researchers eventually built a magnetic read head composed of one of these spintronic sandwiches.
• This MR read head introduced to the market.
• This ensured the next instruction was passing under the drum's read heads just as the current instruction had been executed.
• Also, not too dissimilar to floppy drive users, the Datasette's read head could become dirty or slip out of alignment.
• Magnetized patches on the spinning hard disk flip the spin state in the read head back and forth, transmitting digital data.
• This means the drive's read head doesn't have to travel as far to pick up the files needed to get a program started.
• A spintronic read head can detect much weaker magnetic fields than older devices can, so each bit of data can be much smaller.
• A write head magnetises a region by generating a strong local magnetic field, and a read head detects the magnetisation of the regions.
• Besides its great fundamental interest, room temperature magnetoresistive tunnelling is the basis for practical devices including MRAM and read heads used in hard disks.
• Also, when data is written to the tape it is verified by reading it back using the read heads that are positioned just'behind'the write heads.
• This magnetic read head can also be used to swipe suitable magnetic tickets and will tell the user if the ticket has been through a ticket barrier.
• Since the video and audio read heads were several inches apart it was not possible to make a physical edit that would function correctly in both video and audio.
• This is because seek performance would be greatly affected during random access by the requirement to continually modulate the disc's rotation speed to be appropriate for the read head's position.
• Antiferromagnets can couple to ferromagnetic film, which provides one of the main uses in so-called spin valves, which are the basis of magnetic sensors including modern hard drive read heads.
• As data density increased, read heads using magnetoresistance ( MR ) came into use; the electrical resistance of the head changed according to the strength of the magnetism from the platter.
• Later development made use of spintronics; in read heads, the magnetoresistive effect was much greater than in earlier types, and was dubbed magneto-resistive while the write element is typically thin-film inductive.
• In one attempt to speed up MCP, its overlays were carefully laid out so that the likely-next overlays would soon arrive at their read head just after the current overlay completed.
• Since the EMR effect occurs at room temperature and does not rely on magnetic materials it has many possible benefits for applications including in the read heads of future hard disk drives.
• Another aspect of VXA is that there are 2 read heads for each stripe, slightly offset in relation to each other to allow for more flexibility in reading tapes written by other drives.