FDD = Floppy Disk Drives
HDD = Hard Disk Drives
Capacity 194 MiB for the mini round disc and 650-900MB for the
Capacity 4.7GB single-sided/single-layer
17.08GB double-sided/double-layer (rare)
What are the different writing modes?
CD-R and CD-R/RW recorders employ several different writing modes including Disc-At-Once (DAO), Track-At-Once (TAO), Session-At-Once (SAO), and packet writing. Be aware that not all recorders and software support all writing modes. If in doubt, consult with the product manufacturer.
During DAO recording the Lead-In Area, Program Area and Lead-Out Area of a CD-R or CD-RW disc are consecutively written in a single uninterrupted operation. DAO recording is only possible using a blank disc and, after recording is completed, no additional information can be written. Typically, DAO is used to write CD audio, CD-Text and discs destined for mass replication.
In contrast to DAO, TAO operates by turning the writing laser on and off at the beginning and end of each track and writes the Program Area of a disc before its Lead-In and Lead-Out Areas. It is possible to use a recorder to read from (or write additional tracks to) a TAO disc before a session is fixated. All TAO discs contain 2 to 3 second gaps between tracks (run-in, run-out and link blocks) but some recorders have the ability to vary the size of the gaps.
SAO is much like DAO in that the Lead-In Area, Program Area and Lead-Out Area are consecutively written in a single uninterrupted operation. However, the first session is not finalized so additional sessions can be added. Typically, SAO is used to write
CD Extra (Enhanced Music CD) discs where the first session contains one or multiple audio tracks and the second session consists of multimedia computer data.
Packet writing records variable (CD-R) or fixed (CD-RW) sized chunks or “packets” of data to the disc for as many times as is needed to complete the writing of the user’s files. In the case of a CD-R disc (which is not erasable) data may be added incrementally until the disc becomes full. CD-RW discs, on the other hand, are completely rewritable and thus are a little different from their CD-R cousins in that files can be added and deleted as needed.
High-density optical disc
Capacity 25-50GB single-layer
Storage devices that are portable, thumb-drives, flash, SD-cards etc...
USB -1.0 speed 12Mb
USB -2.0 speed 480Mb
USB -3.0 speed 4 Gbit/s
Capacity 2MB to 128GB
Dimensions Type I 43x36x3.3mm
Type II 43x36x3.5mm
Capacity Standard SD 1MiB to 4GiB
SDHC 4MiB to 32GiB
SDXC 32GiB to 2TiB
Hot Swappable devices and non-hot Swappable devices
A hot swappable device is a device that works right away when you plug it into your computer without having to reboot it. ie... (USB thumb drives, some webcams,and cameras)Devices that require a reboot or drivers to be installed before the device will work are examples of non-hot swappable devices.