Using CrystalDiskMark, I can get 147 MB/s read and 128 MB/s write Seq, but when copying files I only get 21 MB/s. Why?
2023591
Sounds like a USB 2.0 speed. I get that same score on my USB 2.0 port on my Dell Monitor. When I use my Sony All in One USB 3.0 I get very fast speeds that copy 4 HD movies to a 32gb drive in about 4 minutes. It used to take 70 minutes.
982952
I'm using Linux (with BTRFS which provides software raid-like features) but here are likely relevant numbers: Read performance via raid tends to be as fast as the hardware can push data. Writes may take longer as you have to write each copy per raid level. Mirrored data means writing two copies. More complicated RAID may require many reads to calculate parity and two writes for data + parity. I can get about 110 to 130 Megabytes per second read or write throughput via USB towards or from my ProBox. I don't know how Storage Spaces works internally, but you likely near full read performance (120 MBps) vs halved write performance (60 MBps).
1960039
This particular drive is USB2. You'll get about 16 megabytes per second write, 20 to 30 read, depending on file size, fragmentation, etc.
1103975
Currently you are working with the standard rate; "buffer-to-computer" interface is 3.0 Gbit/s SATA. HDD data transfer rate depends upon the rotational speed of the platters and the data recording density. This is controlled by the controllers. To get the 6.0 Gbit speed your motherboard needs to be able to handle SATA 6Gb/s drive controllers. This is pretty standard on new motherboards. Your motherboard may be using the 3Gb controllers thus only getting the standard transfer rate.
349084
Using Disk Speed Test my results are as follows: 109 Write and 106 Read on a Mac partitioned to HSF+. Hope this helps.
1082855
There are two USB connectors on the cable. One is blue and the other black. So there is a difference in connection when you plug it in. As for actual speed - you are connecting a SATA interface to a USB interface and some speed will be lost in the translation process. You also have to take into account the speed of the drive and the buffer/cache on the drive you elect to attach. All of this will impact the connection throughput .
1786850
Well, I have a test tool, that shows 233.7MB/s write and 319.0MB/s read with a SSD drive in an USB 3 enclosure via an iogear USB3 hub.Most USB sticks, or SD cards are way slower than this.The USB3 hub disconnects, when Yosemite goes to sleep. Then via eSata it copies 1.4GB in less than 5s to my backup drive, not sure, if my drive is a bottleneck, but I am happy with the speeds.
1821423
Mine came with the Lite-On mSATA. Crystal Disk benchmarks for my particular SSD: 1st read 437.8 MB/s, 1st write 366.4 MB/s, 263.5, 321.9, 21.19, 42.91, 203.8, 114.2. I recently rechecked the benchmarks and got even higher speeds.
2031654
I've found that usb3 to usb3 transfers are around 100MB/s up to 170MB/s on 3Gb/s Sata Drives you won't see faster than that till you get faster devices. USB3 to internal sata 3Gb/s drives are about 50MB/s to 90MB/s, Depending on processorand drive speeds. USB3 to e-sata Is around 70 -90MB/s The Drivers that came with mine did work. and it did power my usb 2.5" drives. but not more than 1 at a time. with out using the included power cord.
1931462
These drives are kind of strange. It transfers off the drive at high speed (~20 MByte/sec) but only writes at ~2 MByte. So I think it's USB 2.0 but the internal flash management chip on the drive must be pretty inefficient so it can't keep up with the comm. speed when it's doing write operations. Delete operations are also really slow. So overall I probably wouldn't recommend this product. I got them because they were cheap and I don't need high performance for what I'm using them for.
1805803
You should expect to see speeds slower than SATA I (1.5 Gb/s = 150 MiB/s without allowing for overhead), due to the bandwidth of the IDE/PATA interface. Combine this with a lack of NCQ or AHCI support in the PATA specification, and while your speed will be much faster than the old HDDs (or even SSDs) that operated on IDE/PATA, it will be nowhere near the rated speeds for any modern SSD.
1555558
I wrote a non-techie review of my 64g and 128g. I compared writing 37.3 gig of data - the San Disk disk took 5:55 minutes for the 64g and 5:50 for the 128g. The other 2 (not cheapies) took between 25 and 36 minites. All were done with the same source data on the same computer using the same USB3 port. They were all USB 3 drives. Not sure what the specs are, SanDisk has them on their website, but I can tell you it is faster than any of the others out there except maybe the Lexar and the price on those is much higher.
782787
Something is not right there. On a wired 1Gbps connection with a single copy I would expect at least 400Mbps, with speeds over 700Mbps on faster switches (efficient internal packet forwarding). That is from testing when I first received the unit (tested with 4 x 5200 RPM Toshiba 160GB in RAID 5, prior to 4 x 7200 RPM Seagate 750GB in SHR I have had in it since then - but I haven't tried that on a fast switch, my home switch seems to max about 500Mbps).For comparison, I've seen speeds close to single line speed (~900Mbps) on a DS713+/DX513 combo.If you are on WiFi, I would run hardwired tests for comparison. Then start troubleshooting your WiFi. Something is not right there. On a wired 1Gbps connection with a single copy I would expect at least 400Mbps, with speeds over 700Mbps on faster switches (efficient internal packet forwarding). That is from testing when I first received the unit (tested with 4 x 5200 RPM Toshiba 160GB in RAID 5, prior to 4 x 7200 RPM Seagate 750GB in SHR I have had in it since then - but I haven't tried that on a fast switch, my home switch seems to max about 500Mbps).For comparison, I've seen speeds close to single line speed (~900Mbps) on a DS713+/DX513 combo.If you are on WiFi, I... » Read More Something is not right there. On a wired 1Gbps connection with a single copy I would expect at least 400Mbps, with speeds over 700Mbps on faster switches (efficient internal packet forwarding). That is from testing when I first received the unit (tested with 4 x 5200 RPM Toshiba 160GB in RAID 5, prior to 4 x 7200 RPM Seagate 750GB in SHR I have had in it since then - but I haven't tried that on a fast switch, my home switch seems to max about 500Mbps).For comparison, I've seen speeds close to single line speed (~900Mbps) on a DS713+/DX513 combo.If you are on WiFi, I would run hardwired tests for comparison. Then start troubleshooting your WiFi. « Show Less
982950
I'm using Linux (with BTRFS which provides software raid-like features) but here are likely relevant numbers: Read performance via raid tends to be as fast as the hardware can push data. Writes may take longer as you have to write each copy per raid level. Mirrored data means writing two copies. More complicated RAID may require many reads to calculate parity and two writes for data + parity. I can get about 110 to 130 Megabytes per second read or write throughput via USB towards or from my ProBox. I don't know how Storage Spaces works internally, but you likely near full read performance (120 MBps) vs halved write performance (60 MBps). I'm using Linux (with BTRFS which provides software raid-like features) but here are likely relevant numbers: Read performance via raid tends to be as fast as the hardware can push data. Writes may take longer as you have to write each copy per raid level. Mirrored data means writing two copies. More complicated RAID may require many reads to calculate parity and two writes for data + parity. I can get about 110 to 130 Megabytes per second read or write throughput via USB towards or from my ProBox. I don't know how Storage Spaces works internally, but you likely near full read performance... » Read More I'm using Linux (with BTRFS which provides software raid-like features) but here are likely relevant numbers: Read performance via raid tends to be as fast as the hardware can push data. Writes may take longer as you have to write each copy per raid level. Mirrored data means writing two copies. More complicated RAID may require many reads to calculate parity and two writes for data + parity. I can get about 110 to 130 Megabytes per second read or write throughput via USB towards or from my ProBox. I don't know how Storage Spaces works internally, but you likely near full read performance (120 MBps) vs halved write performance (60 MBps). « Show Less
1601569
You are correct (and previous answer is not). The drive interface is 6Gb/sec (that's gigabits per second), as it says on the label. This is the standard speed of Sata3. This translates to roughly 600MB/sec - plenty enough to carry the quoted 550 MB/ sec the drive is capable of.
466450
I have 8 4tb drives running a raid 5 for my media server with no issues. Transfer rate is 6gb/s. Read and write would be a combination of your drives and controller but more your drives then the controller. But flashpoint is right. If you need performance then you will need to go high endon the controller. But I honestly can't picture the need for something better
384452
I believe the wrote speed is up to 90MB/s* and writes up to 60MB/s. Hope this helps.