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Usb 3 transfer rate faster than sata windows 10#
Usb 3 transfer rate faster than sata Pc#

if the files were physically one after another on the hard drive, the drive could copy the next song already in its 32 MB cache and when your music player tries to read the file, it could read it in memory at up to 600 MB/s) The interface is SATA3 (6 gbps or 600 MB/s) and you could potentially get such high speeds if you're reading data from hard drive's cache all the time (for example you load a playlist in your music player, play a song and then go automatically to next song. The mechanical hard drive performance is limited by the mechanical drive itself, not the interface.Īs you can see, the maximum transfer rate (from platters to the 32 MB of cache memory on the hard drive) is listed as 1284 megabits per second - if you divide that by 8, you have 160.5 MB/s (millions of bytes). The benchmarks show 1400 MB/s when reading from SSD which indicate the use of at least 2 pci-e v3.0 lanes, or 4 pci-e v2.0 lanes. Your SSD probably used 4 pci-e lanes to communicate with the computer, giving it a maximum speed of 2 GB/s or ~3.9 GB in both directions. Your NVME SSD connects to the computer through multiple pci-e lanes, where each pci-e lane is capable of 500 MB/s in each direction (for pci-e v2.0 lanes) or 980 MB/s in each direction (for pci-e v3.0 lanes) These limitations were more severe with USB 2.0 where even though the theoretical maximums were something like 46 MB/s in reality, you wouldn't be able to transfer more than around 33-35 MB/s due to the way data was packed and send through the cable. So even though the maximum bandwidth is 500 million bytes, you don't even get those 500 million bytesĪlso due to the limited number of data packets that can go within a second, it's quite possible that you could not actually send up to 500,000,000 bytes in a second.

Because of this packaging of data, for every packet of data, there's a number of bytes of information that's part of the "packet definition" which don't contain useful information, they just make it easier for the usb controller to process the data packets going through the cable.

Usb 3 transfer rate faster than sata Pc#

USB 3 packs all the data that goes through the cable in packets of certain sizes, and there's a limited number of packets that can be sent through the cable to the PC within each second. SATA 3 will keep transferring while it receives messages from the sata controller, without pauses.Ģ. So when you transfer a file through USB 3 from an external device, several times during transfer the hard drive has to pause to receive message from the other end which says "Ok, i got everything so far, keep going" or "Hey dude, this packet of data is damaged, send it again" and then it will resume transferring data. it's half duplex, meaning a device can not send and receive data through the cable at the same time. USB 3 has other disadvantages over SATA3. doing the same math, we have a maximum speed of 500,000,000 bytes per second USB 3 or USB 3.1 gen 1 has a maximum bandwidth of 5gbps. That's 600 MB/s or 572 MiB/s (the measurement unit used when you look at file sizes, you'd transfer 572 MB file in one second) That means an actual (6 / 10) * 8 = 4.8 gbps. So you have SATA 3 with a maximum bandwidth of 6 gbps or 6 billion bits per second.

Usb 3 transfer rate faster than sata windows 10#