Thermal Recalibration
All modern drives use voice
To combat this problem, most drives manufactured in the mid-1990s include a feature called thermal recalibration. Every few minutes, the heads are moved and the distance between tracks measured. This information is recorded in the drive’s memory and used to aid in positioning the heads when reading or writing needs to be done. When the recalibration occurs you can hear the disk operate as if you were reading or writing to it, even if you are not.
Thermal recalibration produces one unfortunate side-effect: if you attempt to access the disk while a recalibration cycle is taking effect, there is a slight pause until it completes. This does not cause any read or write requests to be lost, but it can cause a problem if you are performing a read or write task that is operating in “real time” and might be sensitive to the delay. Common examples include real-time video playback, audio file editing, or burning a recordable CD-ROM disk. For users working with these applications, thermal recalibration represents an unacceptable problem, so the hard disk manufacturers created special drives that work around the recalibration “feature”. Typically by using special buffering techniques or by intelligently “scheduling” recalibration activity to avoid platters being accessed by the user, these drives essentially “hide” recalibration from the PC operator. They were frequently marketed as being “audio/visual” or “A/V” drives during the 1990s.
Today, recalibration has become largely a moot point. The need for constant recalibration was greatly diminished with the creation of embedded servo technology, which is now the standard for hard disk drives
. Recalibration had become a real “black eye” of sorts to hard drive manufacturers over the years, so they were happy to announce to the world that they had “eliminated” thermal recalibration in their newest units. This is sort of true and not true; it would be more accurate to say that it has been greatly reduced. Some degree of recalibration is still required even with the newest drives, but it does not cause the potential impact on performance that users of the old style drives had to deal with.
Data recovery Salon welcomes your comments and share with us your ideas, suggestions and experience. Data recovery salon is dedicated in sharing the most useful data recovery information with our users and only if you are good at data recovery or related knowledge, please kindly drop us an email and we will publish your article here. We need to make data recovery Salon to be the most professional and free data recovery E-book online.
World’s Top Data Recovery Hardware Tools
Head Replacement Tools; HDD Platter Swap Tools; Data Recovery Equipment; Data Recovery Books, all are available in one stop
2015-2018 Top Rated Data Recovery Tools
HDD Repair And Data Recovery For All Hdd Brands;
Repair Or Recovery Multiple Hard Drives At The Same Time;
Disk image, file extraction, fw repair, password removal, smart reset, bad sector repair all in one hardware;
Top-rated technique support and remote support;
Free software upgrade for the first three years;
Many happy users worldwide.