- Obtained from: AliExpress
- Price paid: $14.58
- Advertised capacity: 128GB
- Logical capacity: 127,865,454,592 bytes
- Physical capacity: 127,865,454,592 bytes
- Fake/skimpy flash: Skimpy (0.11% skimp)
- Protected area: 134,217,728 bytes
- Adjusted skimp: 0.00026%
- Speed class markings: Class 10, U1*, A1
- CID data:
- Manufacturer ID:
0x03** - OEM ID:
0x5344(ASCII:SD)** - Product name:
0x5344313238(ASCII:SD128) - Product revision:
0x85
- Manufacturer ID:
| Sample # | 1 | 2 | 3 | Average |
|---|---|---|---|---|
| Manufacture date | Dec 2023 | Dec 2023 | Aug 2023 | N/A |
| Serial number | 0x545a014f | 0x5399d239 | 0x92dccb2b | N/A |
| Sequential read speed (MB/sec) | 162.28 | 173.54 | 151.13 | 162.32 |
| Sequential write speed (MB/sec) | 30.09 | 31.72 | 31.60 | 31.14 |
| Random read speed (IOPS/sec) | 2,300.37 | 2,345.09 | 2,060.45 | 2,235.30 |
| Random write speed (IOPS/sec) | 528.90 | 526.42 | 446.88 | 500.73 |
| Read/write cycles to first error | Not yet determined | Not yet determined | Not yet determined | Not yet determined |
| Read/write cycles to complete failure | Not yet determined | Not yet determined | Not yet determined | Not yet determined |
| Total days to complete failure | Not yet determined | Not yet determined | Not yet determined | Not yet determined |
| Card reader used | JJS CR-UTC4AC | JJS CR-UTC4AC | JJS CR-UTC4AC | N/A |
| Package front |  |  |  | N/A |
| Package back |  |  |  | N/A |
| Card front |  |  |  | N/A |
| Card back |  |  |  | N/A |
* The U1 mark appears on the card, but does not appear on the product packaging.
** This manufacturer ID/OEM ID is pretty well known to be associated with SanDisk.
Discussion
I believe I picked up this one after seeing that SanDisk advertised performance differences between the 32 and 64GB versions of both the Extreme and the Extreme Pro, and I wondered if larger sizes of the SanDisk Ultra would show similar performance improvements when compared to its smaller siblings.
As it turns out, the answer was “yes”: this card did significantly better in sequential read speeds, and mildly better in sequential write speeds, than the SanDisk Ultra 32GB. Random read speeds were worse than the 32GB version, while random write speeds were about the same. Overall, two of the three samples got sequential read speeds that were more than two standard deviations above average, while the third came close. Sequential write speeds were right around average, and random I/O speeds (both read and write) were slightly above average.
Endurance tests for all three models are still ongoing. None of the three have made it to the 2,000 read/write cycle mark. Sample #1 is currently expected to get there sometime in March 2025, while samples #2 and #3 are expected to get there sometime in April 2025.
June 8, 2024