Given the growing demand for increased hard drive capabilities, manufacturers are working on engineering and developing new data storage technologies. Some of these technologies, which are very, very present recording of magnetic fields (Perpendicular Magnetic recorder in English, which is why he explains that PMR), which increases the ability to drive hard while maintaining its size and performance.
What is PMR?
The PMR hard drive, also known as standard recording (CMR), uses a recording method when the pieces of data are directly aligned (that is, the head equals the plates and hence their name) with rotating disc plates.
Magnetic tracks sand write them next to each other without overlappingbut this does it writing head is large in size reading (as you'll understand, two heads are required, one for reading and the other for details) In this PMR technology, manufacturers have tried to reduce writing head size as permitted by physical limitations.
How does this technology affect us?
To understand what affects us, we must first know what is different, what is called SMR (magnetic recording in strata), which is an extension of the PMR but in contrast, magnetic tracks yes, they do gather (creating a strata) that significantly increases the data's distress, and in this case the sequential coding process is used.
The head of learning in both technologies is comfortable to read the data and the functionality is the same, but when we are about to write or edit the information on the SMR disk, the header do not record them directly on an existing track so that it does not damage the nearby track, but does it in a way empty disk space storing the original track and its data for a while (and then deleting it when the disk is empty with a process called reset). This produces several scenarios to consider:
- If the SMR unit performs a long and large operation, there will be no time to rearrange the information.
- If the current scenario is to occur, the disk will have to perform a reorganization while writing, limiting its effectiveness. In PMR discs this is not possible.
- It is not important that the RAID between the PMR and SMR units, since operation can be affected by the above.
You see, a PMR unit may have less difficulty – and consequently a dose – than an SMR, but it does not have its risks. As a result It is important to know at least what kind of hard drive it is before buying it and installing it on our system.