Real data transfer speed USB 2.0, 3.0, 3.1, Ethernet and SATA
USB speeds (vs. FireWire or LAN Ethernet)
USB 2.0 = 480 mbps max and USB 1.1 = 12 mbps
According to NEC (Dec 2004):
"Specified speed of USB 2.0 is 480 mbps (in other words, around 60 Million Bytes per second, or 57.2 MB/s), but 57.2 MB/s is NOT the actual data rate.
This is because USB 2.0 packet is inclusive of overhead data.
[Note that conversion from megabits to MegaBytes requires (x*1,000,000/8)/1,048,576.]
"Specified speed of USB 2.0 is 480 mbps (in other words, around 60 Million Bytes per second, or 57.2 MB/s), but 57.2 MB/s is NOT the actual data rate.
This is because USB 2.0 packet is inclusive of overhead data.
[Note that conversion from megabits to MegaBytes requires (x*1,000,000/8)/1,048,576.]
Moreover, idle time are added between packets.
Besides, data rate is also dependent on the system architecture, the PCI bus and the attached USB devices.
Besides, data rate is also dependent on the system architecture, the PCI bus and the attached USB devices.
Therefore, actual data transfer rate [of USB 2.0 High-speed] will be lower than 480 mbps (57.2 MB/s).
Our measurement result of data transfer rate with USB 2.0 storage device (HDD) is about 20 - 25 MB/s on average."
Our measurement result of data transfer rate with USB 2.0 storage device (HDD) is about 20 - 25 MB/s on average."
About 50% of the 10 Mbps capacity can be used.
100 Mbit Ethernet -- Used within a building. The main standard is called 100BaseT. About 50% of the 100 Mbps capacity can be used. With switches, up to 99.9% of the capacity can be used.
1000 Mbit Ethernet, Gigabit Ethernet -- Used for backbones in buildings. The main standard is called 1000BaseT. About 50% of the 1,000 Mbps capacity can be used. With switches, up to 99.9% of the capacity can be used.
[this means that 100 mbps Ethernet =~ 50 mbps data transfer =~ 4.7 to 6.0 MB/s (max),
and 1000 mbps Ethernet =~ 500 mbps data transfer =~ 47 to 60 MB/s (max) ]
100 Mbit Ethernet -- Used within a building. The main standard is called 100BaseT. About 50% of the 100 Mbps capacity can be used. With switches, up to 99.9% of the capacity can be used.
1000 Mbit Ethernet, Gigabit Ethernet -- Used for backbones in buildings. The main standard is called 1000BaseT. About 50% of the 1,000 Mbps capacity can be used. With switches, up to 99.9% of the capacity can be used.
[this means that 100 mbps Ethernet =~ 50 mbps data transfer =~ 4.7 to 6.0 MB/s (max),
and 1000 mbps Ethernet =~ 500 mbps data transfer =~ 47 to 60 MB/s (max) ]
| Generace SATA |
Standard[1] | Datová propustnost[1] |
Frekvence |
|---|---|---|---|
| 1. | SATA 1,5 Gb/s | 150 MB/s | 1,5 GHz |
| 2. | SATA 3 Gb/s | 300 MB/s | 3 GHz |
| 3. | SATA 6 Gb/s | 600 MB/s | 6 GHz |
Hot Plug
Technologie Hot Plug umožňuje odpojit či připojit daný disk i za běhu a v případě podpory i při spuštěném operačním systému. Pevný disk se tak svým způsobem chová stejně jako flashdisk. Všechna zařízení SATA podporují Hot Plug, nicméně skutečnou podporu Hot Plug umožňují pouze zařízení fungující v nativním režimu a ne v emulaci IDE, což vyžaduje mít v BIOSu nastaven režim AHCI (Advanced Host Controller Interface). Některé z prvních řadičů SATA a starší operační systémy jako například Windows XP přímo nepodporují režim AHCI.... Ovladače zařízení v Microsoft Windows, které jsou označeny jako SATA, obvykle pracují v režimu IDE emulace, pokud není výslovně uvedeno, že mají pracovat v AHCI nebo RAID režimu. Zatímco ovladače, které ...
https://cs.wikipedia.org/wiki/Universal_Serial_Bus#USB-C_.28USB-Type_C.29
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