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Quantum TRB730S

The Quantum Trailblazer 730S was shipped as an Apple OEM hard disk, with a formatted usable capacity of 699MB

# sg_inq /dev/sdd
standard INQUIRY:
  PQual=0  Device_type=0  RMB=0  LU_CONG=0  version=0x02  [SCSI-2]
  [AERC=0]  [TrmTsk=0]  NormACA=0  HiSUP=0  Resp_data_format=1
  SCCS=0  ACC=0  TPGS=0  3PC=0  Protect=0  [BQue=0]
  EncServ=0  MultiP=0  [MChngr=0]  [ACKREQQ=0]  Addr16=0
  [RelAdr=0]  WBus16=0  Sync=1  [Linked=1]  [TranDis=0]  CmdQue=0
    length=54 (0x36)   Peripheral device type: disk
 Vendor identification: QUANTUM
 Product identification: TRB730S
 Product revision level: 043C

root@p3:~# dd if=/dev/sdd of=Apple_Quantum_TRB730S.img iflag=direct bs=1M status=progress
732954624 bytes (733 MB, 699 MiB) copied, 237.364 s, 3.1 MB/s
699+1 records in
699+1 records out
733061120 bytes (733 MB, 699 MiB) copied, 237.412 s, 3.1 MB/s

Performance characteristics

# dd if=/dev/sdd of=Apple_Quantum_TRB730S.img iflag=direct bs=1M status=progress
732954624 bytes (733 MB, 699 MiB) copied, 237.364 s, 3.1 MB/s
699+1 records in
699+1 records out
733061120 bytes (733 MB, 699 MiB) copied, 237.412 s, 3.1 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=512k status=progress count=5000
32505856 bytes (33 MB, 31 MiB) copied, 9.07235 s, 3.6 MB/s
69+0 records in
68+0 records out
35651584 bytes (36 MB, 34 MiB) copied, 10.0855 s, 3.5 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=256k status=progress count=5000
7340032 bytes (7.3 MB, 7.0 MiB) copied, 2.05697 s, 3.6 MB/s
40+0 records in
39+0 records out
10223616 bytes (10 MB, 9.8 MiB) copied, 2.93713 s, 3.5 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=128k status=progress count=5000
14417920 bytes (14 MB, 14 MiB) copied, 4.02926 s, 3.6 MB/s
112+0 records in
111+0 records out
14548992 bytes (15 MB, 14 MiB) copied, 4.09741 s, 3.6 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=64k status=progress count=5000
10747904 bytes (11 MB, 10 MiB) copied, 3.0168 s, 3.6 MB/s  
215+0 records in
214+0 records out
14024704 bytes (14 MB, 13 MiB) copied, 3.9432 s, 3.6 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=32k status=progress count=5000
17956864 bytes (18 MB, 17 MiB) copied, 5.00572 s, 3.6 MB/s
592+0 records in
591+0 records out
19365888 bytes (19 MB, 18 MiB) copied, 5.4119 s, 3.6 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=16k status=progress count=5000
17907712 bytes (18 MB, 17 MiB) copied, 5.00046 s, 3.6 MB/s
1136+0 records in
1135+0 records out
18595840 bytes (19 MB, 18 MiB) copied, 5.20253 s, 3.6 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=8k status=progress count=5000
9461760 bytes (9.5 MB, 9.0 MiB) copied, 3.00182 s, 3.2 MB/s
1323+0 records in
1322+0 records out
10829824 bytes (11 MB, 10 MiB) copied, 3.45521 s, 3.1 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=4k status=progress count=5000
15458304 bytes (15 MB, 15 MiB) copied, 6.00086 s, 2.6 MB/s
4049+0 records in
4048+0 records out
16580608 bytes (17 MB, 16 MiB) copied, 6.43863 s, 2.6 MB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=1k status=progress count=5000
3733504 bytes (3.7 MB, 3.6 MiB) copied, 4.00003 s, 933 kB/s
3689+0 records in
3688+0 records out
3776512 bytes (3.8 MB, 3.6 MiB) copied, 4.05073 s, 932 kB/s

# dd if=/dev/sdd of=fdasfasd iflag=direct bs=512 status=progress count=5000
1897472 bytes (1.9 MB, 1.8 MiB) copied, 4.00043 s, 474 kB/s
3830+0 records in
3829+0 records out
1960448 bytes (2.0 MB, 1.9 MiB) copied, 4.13589 s, 474 kB/s