Performance

BlueSCSI supports Fast SCSI up to 10MB/sec synchronous.

When tuning for performance there are a few factors to keep in mind:

  • The rating, brand, and wear of your SD card can significantly impact performance.
  • The SCSI drivers (especially on a Mac) can make a huge difference. FWB has the best performance on Power Macs, but is not universal so is not included on pre made images.
  • If an image file is fragmented on the SD card performance will be much slower. You will see a warning in the log file.

Results

If you are adding your own result to this page you MUST include the SD Card brand/rating and testing tool. Ones that don’t will be removed.

Machine Drivers SD Tool Read Write Notes
PowerMac 9600 FWB SanDisk Extreme 32GB A1 FWB Bench 8.6 MB/s 7.3 MB/s On internal Fast Bus
Beige G3 FWB WD Purple 32GB UHS-1 SCSI Dir 4 3.3 MB/s 2.9 MB/s Internal Narrow Bus
Beige G3 8.1.4 Sandisk Extreme Pro 64 GB UHS-3 SCSI Dir 4 9.5 MB/s 6.1 MB/s Adaptec AVA-2906 PCI
LC 475 7.3.5 Sandisk Extreme Pro 64 GB UHS-3 SCSI Dir 4 4.84 MB/s 4.48 MB/s Internal
Performa 575 7.3.5 Samsung Pro Endurance 256GB U3 SCSI Dir 4 5.1 MB/s 3.6MB/s 5MB Bus, DB25
II 7.3.5 Sandisk Extreme Pro 64 GB UHS-3 SCSI Dir 4 1.63 MB/s 1.38 MB/s Internal
IIci + cache card 7.3.5 Sandisk Extreme Pro 64 GB UHS-3 SCSI Dir 4 2.09 MB/s 2.03 MB/s Internal
IIvx 7.3.5 Samsung EVO Plus 256 GB SCSI Dir 4 1.57 MB/s 1.40 MB/s Internal
Quadra 700 7.3.5 SanDisk Extreme 32GB A1 SCSI Dir 4 4.3 MB/s 4 MB/s 5MB Bus, DB25
PowerBook 180 Mac OS 8 (driver only, not OS) WD Purple 32GB UHS-1 SCSI Dir 4 1.9 MB/s 1.5 MB/s Internal Narrow Bus
PowerBook 180 Mac OS 7.5.3 WD Purple 32GB UHS-1 SCSI Dir 4 0.7 MB/s 0.8 MB/s Internal Narrow Bus
PowerBook 170 Mac OS 7.5.3 Gigastone Gaming plus 32GB A1 FWB Bench 1.7 MB/s 1.4 MB/s DB25
1 PowerBook 140/170 Mac OS 8 (driver only, not OS) WD Purple 32GB UHS-1 SCSI Dir 4 1.65 MB/s 1.5 MB/s Internal Narrow Bus
1 PowerBook 140/170 Mac OS 7.5.3 WD Purple 32GB UHS-1 SCSI Dir 4 0.65 MB/s 0.73 MB/s Internal Narrow Bus
Plus 7.3.5 Sandisk Extreme Pro 64 GB UHS-3 SCSI Dir 4 0.45 MB/s 0.25 MB/s SCSI Accelerator 7.0 extension
SE 7.3.5 Sandisk Extreme Pro 64 GB UHS-3 SCSI Dir 4 0.68 MB/s 0.50 MB/s External port, desktop version in a case
SE/30 7.3.5 Samsung Pro Endurance 32 GB SCSI Dir 4 1.79 MB/s 1.48 MB/s Internal
Classic Mac OS 7.1.1 Kioxia 32GB Exceria U1 SCSI Dir 4 0.68 MB/s 0.59 MB/s Internal Bus - exFat
Classic II 7.3.5 Samsung Pro Endurance 32 GB SCSI Dir 4 1.35 MB/s 1.10 MB/s Internal
SGI O2 IRIX WD Purple U1 diskperf 9.52 MB/s 6.89 MB/s External SCSI-2
NeXTstation NeXT PNY Elite-X U3 Drive Performance 2.29 MB/s 1.11 MB/s Internal 50-pin (bus limited to 5MB)
PS/2 8556 FAT16B Sandisk Extreme Pro 64 GB UHS-3 Norton System Info 6.0 2.8 MB/s - Internal (5Mb/s)
HP B132L exFAT Samsung Pro Endurance 128 GB hdparm 8.57MB/s - External 50-pin (synchronous 10MB/s) ,Linux

1 This PowerBook is badged 140 on the display but SCSI Director reports it as a 170.

Seek

Note that seek numbers are meaningless in a SD solution - they wait 10ns (10ms on SCSI-1 bus) then return good as there is no actual head to move.

Generated 2024-05-07