Kibibyte per second to Mebibyte per second
KiBps
MiBps
Conversion History
| Conversion | Reuse | Delete |
|---|---|---|
1 KiBps (Kibibyte per second) → 0.0009765625 MiBps (Mebibyte per second) Just now |
Quick Reference Table (Kibibyte per second to Mebibyte per second)
| Kibibyte per second (KiBps) | Mebibyte per second (MiBps) |
|---|---|
| 1 | 0.0009765625 |
| 32 | 0.03125 |
| 128 | 0.125 |
| 512 | 0.5 |
| 1,024 | 1 |
About Kibibyte per second (KiBps)
A kibibyte per second (KiB/s) equals 1,024 bytes per second — the binary IEC equivalent of kilobyte per second. Operating systems such as Linux, macOS, and Windows 10+ increasingly use KiB/s when reporting file transfer speeds to be precise about the binary calculation. A kibibyte per second is about 2.4% more than a kilobyte per second. The distinction matters in embedded systems, microcontrollers, and protocol specifications where exact byte counts determine buffer allocation.
Linux file transfer tools like rsync report speeds in KiB/s by default. A serial link running at 9,600 baud transfers roughly 1.17 KiB/s (1,200 bytes/s).
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.
Kibibyte per second – Frequently Asked Questions
Why does rsync show KiB/s instead of kB/s?
Rsync follows IEC binary conventions because it deals with file sizes that are measured in binary units by the filesystem. Since files occupy whole filesystem blocks (typically 4 KiB), reporting transfer speed in KiB/s makes the math consistent with actual data moved on disk.
Is KiB/s faster or slower than kB/s?
1 KiB/s (1,024 bytes/second) is 2.4% faster than 1 kB/s (1,000 bytes/second). The difference is tiny at this scale but matters when you are designing buffer sizes for embedded systems where every byte of RAM counts.
Why did Windows switch to showing KiB in some places?
Microsoft started using binary units more consistently in Windows 10 after years of ambiguity where "KB" sometimes meant 1,000 and sometimes 1,024 bytes. The shift toward KiB follows IEC recommendations and reduces confusion, though the transition is still incomplete across all Windows tools.
What speed in KiB/s did floppy disk drives achieve?
A 3.5-inch floppy drive transferred data at about 31–62 KiB/s (250–500 kbps). Copying a full 1.44 MB floppy took roughly 25–50 seconds. For comparison, a modern NVMe SSD is about 100,000 times faster.
When does the KiB vs kB distinction cause real problems?
In embedded systems with tight memory constraints, confusing 1,024 with 1,000 can overflow a buffer. In network protocols, a spec written in KiB/s being implemented as kB/s means transmitting 2.4% less data than expected per second — enough to cause timing violations in real-time systems.
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.