The terms write and read speed are used in the context of itwissen.info for the various storage media. For tape drives, hard disks and solid statedrives( SSD), for CD, DVD, BD drives, for memory cards and flash memory, for RAMs and ROMs and for various other storage media.
The write speed is specified in bytes per second (B/s). It is the speed at which data is written to a storage medium. This speed depends on the medium and should not be confused with the access time. As far as the individual storage media are concerned, in the case of magnetic tapes there is a relatively wide range between the various tape drives and their recording methods. Marketable values for write speed range between 100 MB/s and 200 MB/s. Hard disk drives( HDD) have write speeds comparable to those of tape drives. Values range from 100 MB/s to 150 MB/s. Read speeds are slightly higher. Solid-state drives (SSD) are much faster. Their write speed is about twice as high.
For optical storage media, CDs, the write or burn speed is a multiple of 150 kB/s. The write speed is slightly higher. CDs achieve 4.8 MB/s. And with DVDs, the burning speed is a multiple of 1.35 MB/s. At 24x prime rate, the values are over 30 MB/s. Flash memories achieve write speeds of well over 200 MB/s, and their read speed is over 300 MB/s. Special memory cards such as the CFast card have read speeds of over 450 MB/s. The values are surpassed many times over by the write speeds of the RAM. Depending on the DDR process, RAM technology and clock rate, the values for data transfer rates range from a few gigabytes per second( GB/s) to over 30 GB/s.