Mebibyte per second to Mebibit per second
MiBps
Mibps
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
1 MiBps (Mebibyte per second) → 8 Mibps (Mebibit per second) Just now |
Quick Reference Table (Mebibyte per second to Mebibit per second)
| Mebibyte per second (MiBps) | Mebibit per second (Mibps) |
|---|---|
| 1 | 8 |
| 10 | 80 |
| 60 | 480 |
| 125 | 1,000 |
| 550 | 4,400 |
| 1,000 | 8,000 |
| 7,000 | 56,000 |
About Mebibyte per second (MiBps)
A mebibyte per second (MiB/s) equals 1,048,576 bytes per second and is the binary unit most commonly seen in operating system disk and memory bandwidth reports. Linux tools like dd, rsync, and hdparm report I/O speeds in MiB/s. Windows Task Manager and Resource Monitor use MB/s, which is decimal. A USB 2.0 high-speed connection peaks at about 60 MiB/s; a SATA SSD reads at 500–600 MiB/s; an NVMe SSD reaches 3,500–7,000 MiB/s.
Running dd on Linux to test disk speed shows results in MiB/s. A SATA III SSD typically reads at around 550 MiB/s.
About Mebibit per second (Mibps)
A mebibit per second (Mibps) equals 1,048,576 bits per second — the binary IEC equivalent of megabit per second. It is approximately 4.9% larger than 1 Mbps. Mibps appears in network performance specifications written to IEC standards, and in operating system tools on Linux and some Unix variants that apply binary prefixes strictly. When a Linux system reports "ethtool: speed 100MiB/s", this distinction from 100 MB/s (decimal) matters in precise bandwidth budgeting.
A 100 Mibps figure represents 104.86 Mbps in decimal — about 5% more data. Network engineers use Mibps when exact binary calculations are required for buffer sizing.
Mebibyte per second – Frequently Asked Questions
Why does dd report in MiB/s while manufacturers advertise in MB/s?
dd uses binary units because Linux filesystems work in binary block sizes (4 KiB, etc.). Drive manufacturers use decimal MB/s because it makes speeds look about 5% higher and aligns with their decimal capacity marketing. A "550 MB/s" SSD shows roughly 524 MiB/s in dd.
How do I benchmark my disk speed in MiB/s on Linux?
Run "dd if=/dev/zero of=testfile bs=1M count=1024 oflag=direct" and it will report write speed in MiB/s. For read speed, use "dd if=testfile of=/dev/null bs=1M". The oflag=direct flag bypasses filesystem cache to measure actual disk performance.
Is 550 MiB/s the same as 550 MB/s?
No — 550 MiB/s is about 577 MB/s, and 550 MB/s is about 524 MiB/s. The ~5% difference means an SSD advertised at 550 MB/s will show around 524 MiB/s in Linux tools. It is not a defect or false advertising, just different unit systems measuring the same physical speed.
What MiB/s should I expect from a RAID array?
A RAID 0 stripe of two SATA SSDs gives roughly 1,000–1,100 MiB/s sequential reads. Four NVMe SSDs in RAID 0 can hit 12,000–14,000 MiB/s. RAID 5/6 arrays sacrifice some write speed for redundancy — expect 70–90% of raw stripe performance on writes.
Why is random I/O speed so much lower than sequential MiB/s?
Sequential reads let the drive stream data from contiguous locations, maximising throughput. Random I/O forces the controller to seek different addresses, adding latency per operation. An NVMe SSD might do 7,000 MiB/s sequential but only 50–80 MiB/s random (at 4 KiB block size), because the bottleneck shifts from bandwidth to IOPS.
Mebibit per second – Frequently Asked Questions
When would I encounter mebibits instead of megabits?
Mainly in Linux system tools, IEC-compliant technical specifications, and some enterprise storage documentation. The iperf3 network testing tool can report in Mibps if configured to use binary units. Most consumer-facing software and ISPs use megabits exclusively.
How do I convert Mibps to Mbps?
Multiply by 1.048576. So 100 Mibps = 104.86 Mbps. To go from Mbps to Mibps, divide by 1.048576. At small values the difference is negligible, but at gigabit scales it can mean a meaningful amount of data.
Why does Linux sometimes use binary units for networking?
Linux kernel developers historically followed IEC recommendations to use binary prefixes where applicable. Some tools like dd and rsync default to binary (MiB/s) for disk operations. However, network-facing tools like ethtool and ip still use decimal Mbps because that is what the hardware reports.
Does the 5% difference between Mibps and Mbps matter in practice?
For casual use, no. For capacity planning and SLA compliance, yes. If a contract guarantees 100 Mibps and the provider measures in Mbps, the customer might get 100 Mbps (only 95.4 Mibps) and technically be short-changed. Data center SLAs should specify which unit system applies.
Is my ISP cheating me by using megabits instead of mebibits?
No — ISPs legitimately use decimal megabits because Ethernet and fiber standards are decimal. A "100 Mbps" plan genuinely delivers 100,000,000 bits per second. The confusion arises only when comparing with binary-unit tools. ISPs are not hiding anything; the two systems just coexist awkwardly.