- Interface: Standard Enhanced IDE (ATAPI) bus interface (UDMA/33)
- Formats supported:
- DVD family: DVD-ROM, DVD-R, DVD-RW,DVD-Video
- DVD-RAM family: 2.6 GBytes per side, 4.7 GBytes per side
(Type 2)
- CD family: CD-DA, CD-ROM/XA, CD-R,CD-RW,CD-I,
Video CD, Photo-CD,CD-Extra
- Reading of discs of 8 and 12 cm in diameter
- Data buffer: 512 KBytes
- Data rate:
- DVD-ROM: 16.2 MBytes/s (12X)
- DVD-RAM: 2.77 MBytes/s (2x)
- CD-ROM: 6 MBytes/s (40X)
- Access time:
- DVD: 120 ms typical
- DVD-RAM: 210 ms typical
- CD: 90 ms typical
- Error-free running time:
- MTBF 125,000 Power On Hours (POH) when used in office
- Installation: horizontal or vertical
- Weight: 0.98 kg
We got only an OEM version of this drive. The design is ascetic:
there is only an Open/Close button on the front panel. The drive, however,
has a dust-proof case. According to the manual, vibration and a noise level
are low. Moreover, it supports operation with DVD-RAM Type
2 discs.
Test results
Tests of quality of operation with CDs
CD WinBench 99
- CDWinMark99 - Failed (the CD WinBench 99 hung in the CD-ROM
Playback/TripMaker Deluxe test)
- CD-ROM Transfer Rate
- Inside - 2750 KBytes/s
- Outside - 5680 KBytes/s
- CPU utilization - 7.76%
- CD-ROM Access Time - 102 ms
Nero CD Speed
The following information on the drive is obtained with the Drive
check utility:
- Vendor: HITACHI
- Product: DVD-ROM GD-7500
- Firmware version: 0005
- Buffer size: 512 KBytes
- Maximum read speed: 7056 KBytes/sec (40X)
- CDDA accurate: yes
- C2 pointers: yes
- Speed settings: 4X
- Read RAW mode: yes
According to these data, the drive is ideal, but later you will see that
the program detected speeds incorrectly.
Tests of the drive with a standard CD
| |
HITACHI GD-7500 |
| Average Speed |
30.69x
|
| Start Speed |
17.84x
|
| End Speed |
40.68x
|
| Random Seek |
102 ms
|
| 1/3 Seek |
115 ms
|
| Full Seek |
180 ms
|
| Reading type |
CAV
|
| CPU usage 1x |
1%
|
| Accurate stream |
Yes
|
| DAE quality Score |
10
|
| SpinUp Time |
5.17 sec
|
| SpinDown Time |
2.52 sec
|
| Disc Recognition Time |
6.17 sec
|
CD-ROM Drive Analyzer
CD-R reading
CD-RW reading
Reading of a scratched CD
The drive reads CD-RW discs at quite a low speed. In case
of the low-quality disc the speed was almost zero, and the CPU utilization
was unbelievably high.
Advanced DAE Quality (Nero CD Speed)
| Offset |
2548 bytes (637 samples) |
| Sequential Read Test |
Average Speed: 14.57 X
Data Errors: 1175
Sync Errors: 0 |
| Harmonica Read Test |
Average Access Time: 160 ms
Data Errors: 0
Sync Errors: 0
Total Data Errors: 1175
Total Sync Errors: 0
Quality Score: 100.0 |
| On The Fly Copying Simulation |
Copying at 1 X
OK
Copying at 2 X
OK
Copying at 4 X
OK
Copying at 6 X
OK
Copying at 8 X
OK
Copying at 10 X
too slow
Copying at 12 X
too slow
Copying at 16 X
too slow |
| CD Text |
Drive is capable of reading CD Text information |
| Subchannel Data |
Test 1
Track (01): 01
Relative position (01:05.00): 01:05.00
Absolute position (01:07.00): 01:07.00
Index (5): 5
Test 2
Track (17): 17
Relative position (01:33.00): 01:33.00
Absolute position (33:35.00): 33:35.00
Index (1): 1
Test 3
Track (36): 36
Relative position (00:00.00): 00:00.00
Absolute position (70:02.00): 70:02.00
Index (1): 1 |
| Leadin |
Drive can read max. 150 sectors (-00:02.00) from the Leadin |
| Leadout |
Drive cannot read data from the Leadout |
The drive has confidently coped with all the errors.
Soundtrack extraction from audio CDs (CD DAE 99)
| |
Licensed CD |
Pirated CD |
| Average extraction speed |
14.4X |
14.2X |
| Total errors |
0.00% |
0.00% |
Direct copying of data from a 780 MBytes CD-R onto a hard
disc
The drive has copied successfully a 780 MBytes disc without any problems.
The time it spent for the copying was 6 min. 2 sec.
Tests of quality of operation with DVD discs
Nero DVD Speed
Testing with a two-layer DVD disc
| |
HITACHI GD-7500 |
| Average Speed |
6.260x |
| Start Speed |
3.43x |
| End Speed |
4.37x |
| Random Seek |
121 ms |
| 1/3 Seek |
135 ms |
| Full Seek |
212 ms |
| Reading type |
CAV |
| CPU usage 1x |
20% |
| SpinUp Time |
3.79 sec |
| SpinDown Time |
N/A |
| Layer Change Time |
345 ms |
| Disc Recognition Time |
6.99 sec |
DVD-Video playback with the Cyberlink PowerDVD
2.55
The DVD-Video was played without any problems; no artifacts were noticed.
During changing the layer the DVD quality didn't get worse.
Noise characteristics
- Tray - 3/10
- CD
- Seek - 5/10
- Total noise - 3/10
- DVD
- Seek - 6/10
- Total noise - 4/10
The drive makes quite a lot of noise when working at the highest speed.
When we reduced the speed with the help of external programs (CD
Bremse, Nero DriveSpeed) the noise level got acceptable.
It is possible to decrease the speed to 4x-8x-16x-17x (according
to the program).
Vibration
When working with a badly balanced CD the drive didn't perform well. The vibration was quite noticeable even at the reduced speed, and at high
speeds when reading high-quality discs.
Thermal conditions
There are no any complains about its thermal conditions. The data were
read after an intensive 2-hour operation:
- T inside the case - 36°C
- T of the upper surface - 39°C
- T of the lower surface - 41°C
Possibility to make a multizone drive (RPC-1)
According to www.firmware.fr.st,
the drive can become a multizone one by changing its firmware version.
Or you can just null the region measuring counter with this
utility.
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