so.. i am on os x but willing to create a knoppix usb drive if necessary. i need some help with testdisk which i have been using with os x- the testdisk forums are slow and i'm not sure if i will get another response. i have a western digital 2tb my passport, formatted fat32, which now has physical damage from use with a friend's netbook. i cloned the drive to a new 2tb drive with ddrescue but it could not save 4096 bytes of data, which i think was at the beginning of the drive. here is my testdisk log from the cloned disk. the hfs+ partition that it sees is not the one i want, that was the formatting on the drive i wrote to. i need to work with the fat32 partition it says it cannot save.
Analyse Disk /dev/rdisk2 - 2000 GB / 1862 GiB - 3906963456 sectors
Geometry from i386 MBR: head=255 sector=63
BAD_RS LBA=1 1339
check_part_i386 1 type EE: no test
get_geometry_from_list_part_aux head=1 nbr=2
get_geometry_from_list_part_aux head=8 nbr=1
get_geometry_from_list_part_aux head=16 nbr=1
get_geometry_from_list_part_aux head=32 nbr=1
get_geometry_from_list_part_aux head=64 nbr=1
get_geometry_from_list_part_aux head=128 nbr=1
get_geometry_from_list_part_aux head=240 nbr=1
get_geometry_from_list_part_aux head=255 nbr=1
Current partition structure:
1 P EFI GPT 1 3906963448 3906963448
Warning: Bad starting sector (CHS and LBA don't match)
No partition is bootable
search_part()
Disk /dev/rdisk2 - 2000 GB / 1862 GiB - 3906963456 sectors
FAT32 at 8/0/1
FAT1 : 32-476839
FAT2 : 476840-953647
start_rootdir : 953648 root cluster : 2
Data : 953648-3906963439
sectors : 3906963454
cluster_size : 64
no_of_cluster : 61031403 (2 - 61031404)
fat_length 476808 calculated 476808
FAT differs, FAT sectors=0-16/476808
heads/cylinder 255 (FAT) != 1 (HD)
sect/track 32 (FAT) != 1 (HD)
set_FAT_info: name from BS used
FAT32 at 8/0/1
FAT32 LBA 8 3906963461 3906963454 [UNTITLED]
FAT32, blocksize=32768, 2000 GB / 1862 GiB
This partition ends after the disk limits. (start=8, size=3906963454, end=3906963461, disk end=3906963456)
HFS+ magic value at 409640/0/1
part_size 3906291632
HFS 409640 3906701271 3906291632
HFS+ blocksize=4096, 2000 GB / 1862 GiB
Disk /dev/rdisk2 - 2000 GB / 1862 GiB - 3906963456 sectors
Check the harddisk size: HD jumpers settings, BIOS detection...
The harddisk (2000 GB / 1862 GiB) seems too small! (< 2000 GB / 1862 GiB)
The following partition can't be recovered:
FAT32 LBA 8 3906963461 3906963454 [UNTITLED]
FAT32, blocksize=32768, 2000 GB / 1862 GiB
get_geometry_from_list_part_aux head=1 nbr=2
get_geometry_from_list_part_aux head=8 nbr=2
Warning: the current number of heads per cylinder is 1 but the correct value may be 8.
Results
* HFS 409640 3906701271 3906291632
HFS+ blocksize=4096, 2000 GB / 1862 GiB
interface_write()
1 * HFS 409640 3906701271 3906291632
simulate write!
write_mbr_i386: starting...
write_all_log_i386: starting...
No extended partition
TestDisk exited normally.
thanks much.
Dell PowerEdge R640 Server | 2x Gold 6132 28 Cores | H730p | Choose RAM / DRIVES
$2630.00
### MZ-7KE1T0 Samsung 850 Pro Series 1TB 2.5 inch SATA3 SSD ###
$105.00
M.2 NVME SATA SSD Enclosure USB 3.2 Gen 2 10Gbps for M-Key or M+B Key SSD to 8TB
$19.86
WD 500GB My Passport SSD, Portable External Solid State Drive WDBAGF5000ARD-WESN
$59.99
Patriot P210 128GB 256GB 512GB 1TB 2TB 2.5" SATA 3 6GB/s Internal SSD PC/MAC Lot
$14.99
Micron 5100 MAX 120GB SATA 6Gb/s 2.5" Internal SSD MTFDDAK120TCC Solid State
$9.99
Intel DC S3510 Series 120GB SSD 2.5" 6Gb/s SATA Solid State Drive SSDSC2BB120G6K
$9.99
Western Digital PC SN730 256GB NVMe SDBQNTY-256G M.2 2280 PCIe Solid State (SSD)
$16.00
Netac 1TB 2TB 512GB Internal SSD 2.5'' SATA III 6Gb/s Solid State Drive lot
$109.99
Fanxiang SSD 512GB 1TB 2TB 4TB 2.5'' SSD SATA III Internal Solid State Drive lot
$198.99