- Obtained from: Amazon
- Price paid: $11.99
- Advertised capacity: 64GB
- Logical capacity: 62,545,461,248 bytes
- Physical capacity: 62,545,461,248 bytes
- Fake/skimpy flash: Skimpy (2.27% skimp)
- Protected area: 134,217,728 bytes
- Adjusted skimp: 2.06%
- Speed class markings: Class 10, U1
- CID data:
- Manufacturer ID:
0x74* - OEM ID:
0x4a60(ASCII:J`)* - Product name:
0x5553445531(ASCII:USDU1) - Product revision:
0x20
- Manufacturer ID:
| Sample # | 1 | 2 | 3 | Average |
|---|---|---|---|---|
| Manufacture date | Mar 2024 | Mar 2024 | Apr 2024 | N/A |
| Serial number | 0x310fac6f | 0x310fac8d | 0x30100919 | N/A |
| Sequential read speed (MB/sec) | 94.45 | 92.46 | 91.42 | 92.78 |
| Sequential write speed (MB/sec) | 44.05 | 35.24 | 38.49 | 39.26 |
| Random read speed (IOPS/sec) | 2,818.95 | 2,802.77 | 2,696.55 | 2,772.76 |
| Random write speed (IOPS/sec) | 520.52 | 324.89 | 517.74 | 454.38 |
| Read/write cycles to first error | 1,446 | Not yet determined | 962 | 1,204 |
| 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 | JJC CR-UTC4AC | JJC CR-UTC4AC | JJC CR-UTC4AC | N/A |
| Package front |  |  |  | N/A |
| Package back |  |  |  | N/A |
| Card front |  |  |  | N/A |
| Card back |  |  |  | N/A |
* This manufacturer ID/OEM ID is pretty well known to be associated with Transcend.
Discussion
Transcend is a brand that I hadn’t really considered until I went out and searched for “microSD card reliability” (I keep hoping I’ll show up in the search results…you know, before page 100) and stumbled upon a survey asking people to rank what the most reliable SD card was.
Performance for all three samples was…decent. Sequential read speeds, sequential write speeds, and random write speeds were all less than one standard deviation above average (with the exception of sample #2, whose random write speeds were a bit below average). Random read speeds for all three were more than one standard deviation above average.
Endurance testing for all three samples is still ongoing:
- Sample #1’s first error was a single bit flip, in a single sector, during round 1,447. It has survived 1,529 read/write cycles in total so far.
- Sample #2 has survived 2,724 read/write cycles so far and has not yet experienced any errors.
- Sample #3’s first error was a four-sector wide address decoding error during round 963. It has survived 1,382 read/write cycles in total so far.
October 28, 2024 (current number of read/write cycles updates automatically every hour)