Here is benchmarks With 512 blocksize:
MKSoft DiskSpeed 4.2 Copyright © 1989-92 MKSoft Development
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CPU: 68040 AmigaOS Version: 45.57 Normal Video DMA
Device: systemide: Buffers: 400
Comments: DiskSpeed 4.2
No CPU Speed Rating -- CPU % not available.
Testing directory manipulation speed.
File Create: 426 files/sec
File Open: 1149 files/sec
Directory Scan: 3843 files/sec
File Delete: 299 files/sec
Seek/Read: 488 seeks/sec
Testing with a 512 byte, MEMF_FAST, LONG-aligned buffer.
Create file: 460339 bytes/sec
Write to file: 1139200 bytes/sec
Read from file: 1191768 bytes/sec
Testing with a 4096 byte, MEMF_FAST, LONG-aligned buffer.
Create file: 2211840 bytes/sec
Write to file: 3850485 bytes/sec
Read from file: 2774313 bytes/sec
Testing with a 262144 byte, MEMF_FAST, LONG-aligned buffer.
Create file: 4980736 bytes/sec
Write to file: 6168094 bytes/sec
Read from file: 4993219 bytes/sec
Testing with a 524288 byte, MEMF_FAST, LONG-aligned buffer.
Create file: 5339970 bytes/sec
Write to file: 6229164 bytes/sec
Read from file: 5090174 bytes/sec
Testing with a 512 byte, MEMF_FAST, WORD-aligned buffer.
Create file: 415840 bytes/sec
Write to file: 1069568 bytes/sec
Read from file: 1212928 bytes/sec
Testing with a 4096 byte, MEMF_FAST, WORD-aligned buffer.
Create file: 1837266 bytes/sec
Write to file: 3510857 bytes/sec
Read from file: 2700659 bytes/sec
Testing with a 262144 byte, MEMF_FAST, WORD-aligned buffer.
Create file: 3622918 bytes/sec
Write to file: 5190970 bytes/sec
Read from file: 4204196 bytes/sec
Testing with a 524288 byte, MEMF_FAST, WORD-aligned buffer.
Create file: 4213028 bytes/sec
Write to file: 5190970 bytes/sec
Read from file: 4152776 bytes/sec
Testing with a 512 byte, MEMF_FAST, BYTE-aligned buffer.
Create file: 414305 bytes/sec
Write to file: 1099264 bytes/sec
Read from file: 1146880 bytes/sec
Testing with a 4096 byte, MEMF_FAST, BYTE-aligned buffer.
Create file: 1481270 bytes/sec
Write to file: 2786589 bytes/sec
Read from file: 2438777 bytes/sec
Testing with a 262144 byte, MEMF_FAST, BYTE-aligned buffer.
Create file: 2535241 bytes/sec
Write to file: 3737794 bytes/sec
Read from file: 3133195 bytes/sec
Testing with a 524288 byte, MEMF_FAST, BYTE-aligned buffer.
Create file: 3051142 bytes/sec
Write to file: 3883614 bytes/sec
Read from file: 3199665 bytes/sec