recording density

Recording density was 128 characters per inch (198 micrometre/character) on eight tracks.

Effective recording density increased over time.

Depending on recording density of the medium, and/or the destruction technique, this may leave data recoverable by laboratory methods.

HDD data transfer rate depends upon the rotational speed of the disks and the data recording density.

The drive uses European Computer Manufacturing Association media standards, which increase capacity through zone-bit recording techniques, increased linear recording density and decreased track spacing.

The extra bits themselves take up space on the HDD, but allow higher recording densities to be employed without causing uncorrectable errors, resulting in much larger storage capacity.

A long play variant, DVCPRO HD-LP, doubles the recording density by using 9 μm track pitch.

The higher capacity was achieved at the same recording density by varying the disk rotation speed with arm position so that the linear speed of the head was closer to constant.

Noise-Predictive Maximum-Likelihood (NPML) is an advanced digital signal-processing method suitable for magnetic data storage systems that operate at high linear recording densities.

This may have helped ensure the necessary recording density on an "unlucky" head/platter pair or Western Digital just wanted to lower the drive's power consumption some more, but these are only our suppositions.

Pit depth modulation, which the company later branded MultiLevel Recording (ML), is one of many techniques to increase recording densities on conventional CD-optical media.

Another technology used to overcome thermal effects to allow greater recording densities is perpendicular recording, first shipped in 2005, and as of 2007 the technology was used in many HDDs.

This doubled recording density compensates for the 1/2 coding rate of this code (it takes two bits to represent one bit of real information) and makes it equivalent to a rate-1 code.

"The rate of improvement in recording density has slowed down just as all of the techies thought it would," said James N. Porter, president of Disk/Trend, a storage industry market research firm.

FASTRAND III, introduced in 1970, was physically identical to the FASTRAND II, but increased the recording density by 50%.

But, as the operating point moves to higher linear recording densities, this assumption no longer holds and there is a loss of optimality associated with linear partial-response (PR) equalization, which enhances noise and renders it correlated.

Micropolis's first advance was to take the existing 48 TPI (tracks per inch) standard created by Shugart Associates, and double both the track density and track recording density to get 4 times the total storage on a 5.25 inch floppy.

Although advances in head and media technologies have historically been the driving forces behind the increases in the areal recording density, digital signal processing and coding established themselves as cost-efficient techniques for enabling additional substantial increases in areal density while preserving the high reliability of hard disk drive (HDD) systems.